Migrate Meta/MetaDetail models from Gson to kotlinx.serialization

Gson is JVM-only and can't live in shared commonMain, which was the real
reason Meta/MetaDetail/Video/CastMember/DetailTrailer were stuck in the
Android-only app module. Ports the existing JsonElement-tree-based custom
parsing (flexible alternate-key extraction, free-form cast/trailer JSON
tolerance) to kotlinx.serialization's equivalent JsonObject/JsonElement API,
using @JsonNames for simple alternate keys and custom KSerializers for
CastMember/DetailTrailer/MetaDetail where the existing Gson deserializers did
manual extraction.

StremioAddonResourceClient now parses addon catalog/meta responses via
kotlinx.serialization (stremioJson) instead of Gson for these types; Gson
stays in place for Stream/SubtitleData, which are out of scope here.
StremioService.getMetaDetail now returns the raw response body instead of
relying on Retrofit's automatic (Gson-based) conversion, since the models it
returns no longer carry Gson annotations.

Verified on-device: addon catalog list parsing (Home rows), billboard, and
meta detail (title/year/runtime/description) all render correctly against
real addon responses.

data/build.gradle.kts

@@ -4,6 +4,7 @@ plugins {
     alias(libs.plugins.fluxa.kmp.library)
     alias(libs.plugins.fluxa.android.hilt)
     alias(libs.plugins.ksp)
+    alias(libs.plugins.kotlin.serialization)
 }
 
 val localProperties = Properties().apply {
@@ -43,6 +44,11 @@ kotlin {
     tvosSimulatorArm64()
 
     sourceSets {
+        commonMain {
+            dependencies {
+                implementation(libs.kotlinx.serialization.json)
+            }
+        }
         androidMain {
             kotlin.srcDir("src/main/java")
             dependencies {

data/src/commonMain/kotlin/com/fluxa/app/data/remote/MetaModels.kt

@@ -1,14 +1,32 @@
 package com.fluxa.app.data.remote
 
-import com.google.gson.JsonDeserializer
-import com.google.gson.JsonElement
-import com.google.gson.JsonObject
-import com.google.gson.annotations.JsonAdapter
-import com.google.gson.annotations.SerializedName
-import java.lang.reflect.Type
+import kotlinx.serialization.KSerializer
+import kotlinx.serialization.SerialName
+import kotlinx.serialization.Serializable
+import kotlinx.serialization.descriptors.PrimitiveKind
+import kotlinx.serialization.descriptors.PrimitiveSerialDescriptor
+import kotlinx.serialization.descriptors.SerialDescriptor
+import kotlinx.serialization.encoding.Decoder
+import kotlinx.serialization.encoding.Encoder
+import kotlinx.serialization.json.JsonArray
+import kotlinx.serialization.json.JsonDecoder
+import kotlinx.serialization.json.JsonElement
+import kotlinx.serialization.json.JsonEncoder
+import kotlinx.serialization.json.JsonNull
+import kotlinx.serialization.json.JsonObject
+import kotlinx.serialization.json.JsonPrimitive
+import kotlinx.serialization.json.buildJsonObject
+import kotlinx.serialization.json.contentOrNull
+import kotlinx.serialization.json.encodeToJsonElement
+import kotlinx.serialization.json.jsonArray
+import kotlinx.serialization.json.jsonObject
+import kotlinx.serialization.json.jsonPrimitive
+import kotlinx.serialization.json.put
 
-data class MetaRating(val source: String, val value: Any?)
+@Serializable
+data class MetaRating(val source: String, val value: String?)
 
+@Serializable
 data class AppExtras(
     val seasonPosters: List<String?>? = null,
     val certification: String? = null,
@@ -16,85 +34,26 @@ data class AppExtras(
     val cast: List<CastMember>? = null
 )
 
-@JsonAdapter(MetaDetailDeserializer::class)
-data class MetaDetail(
+@Serializable
+data class MetaLink(val name: String, val category: String, val url: String)
+
+@Serializable
+data class Video(
     val id: String,
-    val type: String,
-    val name: String,
-    @JsonAdapter(StringListDeserializer::class) val genres: List<String>?,
-    val poster: String?,
-    val background: String?,
-    val logo: String?,
-    val description: String?,
-    val releaseInfo: String?,
-    val released: String? = null,
-    val runtime: String?,
-    @SerializedName(value = "videos", alternate = ["episodes"]) val videos: List<Video>?,
-    val trailers: List<DetailTrailer>? = null,
-    val imdbRating: String? = null,
-    val ageRating: String? = null,
-    val ratings: List<MetaRating>? = null,
-    val cast: List<CastMember>? = null,
-    @JsonAdapter(StringListDeserializer::class) val director: List<String>? = null,
-    val links: List<MetaLink>? = null,
-    val status: String? = null,
-    val seasonsCount: Int? = null,
-    @JsonAdapter(StringListDeserializer::class) val platforms: List<String>? = null,
-    val awards: String? = null,
-    val originalLanguage: String? = null,
-    val originalName: String? = null,
-    val country: String? = null,
-    @JsonAdapter(StringListDeserializer::class) val productionCompanies: List<String>? = null,
-    @JsonAdapter(StringListDeserializer::class) val networks: List<String>? = null,
-    val collectionName: String? = null,
-    val collectionId: Int? = null,
-    val collectionParts: List<Meta>? = null,
-    val seasonPosters: Map<String, String>? = null,
-    @SerializedName("app_extras") val appExtras: AppExtras? = null
+    @SerialName("name") val name: String? = null,
+    val season: Int? = null,
+    @SerialName("number") val number: Int? = null,
+    @SerialName("released") val released: String? = null,
+    val thumbnail: String? = null,
+    @SerialName("overview") val overview: String? = null,
+    val rating: String? = null,
+    val episodeRuntime: Int? = null
 )
 
-class MetaDetailDeserializer : JsonDeserializer<MetaDetail> {
-    override fun deserialize(json: JsonElement, typeOfT: Type, context: com.google.gson.JsonDeserializationContext): MetaDetail {
-        val obj = json.asObjectOrNull() ?: JsonObject()
-        return MetaDetail(
-            id = obj.text("id").orEmpty(),
-            type = obj.text("type").orEmpty(),
-            name = obj.text("name").orEmpty(),
-            genres = obj.stringList("genres"),
-            poster = obj.text("poster"),
-            background = obj.text("background"),
-            logo = obj.text("logo"),
-            description = obj.text("description"),
-            releaseInfo = obj.text("releaseInfo", "year"),
-            released = obj.text("released"),
-            runtime = obj.text("runtime"),
-            videos = obj.videoList("videos", "episodes"),
-            trailers = obj.trailerList(),
-            imdbRating = obj.text("imdbRating", "imdb_rating"),
-            ageRating = obj.text("ageRating", "age_rating"),
-            ratings = obj.ratingList(),
-            cast = obj.castList("cast"),
-            director = obj.stringList("director"),
-            links = obj.linkList(),
-            status = obj.text("status"),
-            seasonsCount = obj.int("seasonsCount", "seasons_count"),
-            platforms = obj.stringList("platforms"),
-            awards = obj.text("awards"),
-            originalLanguage = obj.text("originalLanguage", "original_language"),
-            originalName = obj.text("originalName", "original_name"),
-            country = obj.text("country"),
-            productionCompanies = obj.stringList("productionCompanies", "production_companies"),
-            networks = obj.stringList("networks"),
-            collectionName = obj.text("collectionName", "collection_name"),
-            collectionId = obj.int("collectionId", "collection_id"),
-            collectionParts = null,
-            seasonPosters = obj.stringMap("seasonPosters", "season_posters"),
-            appExtras = obj.appExtras()
-        )
-    }
-}
+@Serializable(with = CastMemberSerializer::class)
+data class CastMember(val name: String, val character: String?, val profilePath: String?)
 
-@JsonAdapter(DetailTrailerDeserializer::class)
+@Serializable(with = DetailTrailerSerializer::class)
 data class DetailTrailer(
     val id: String,
     val title: String,
@@ -104,57 +63,55 @@ data class DetailTrailer(
     val source: String
 )
 
-class DetailTrailerDeserializer : JsonDeserializer<DetailTrailer> {
-    override fun deserialize(json: JsonElement, typeOfT: Type, context: com.google.gson.JsonDeserializationContext): DetailTrailer {
-        return detailTrailerFromJson(json)
-    }
-}
+@Serializable
+data class MetaDetailResponse(val meta: MetaDetail? = null)
 
-class StringListDeserializer : JsonDeserializer<List<String>?> {
-    override fun deserialize(json: JsonElement, typeOfT: Type, context: com.google.gson.JsonDeserializationContext): List<String>? {
-        if (json.isJsonNull) return null
-        if (json.isJsonArray) {
-            return json.asJsonArray
-                .mapNotNull { item -> item.safeString()?.trim()?.takeIf { value -> value.isNotBlank() } }
-                .takeIf { it.isNotEmpty() }
-        }
-        return json.safeString()
-            ?.takeIf { it.isNotBlank() }
-            ?.split(',')
-            ?.mapNotNull { it.trim().takeIf(String::isNotBlank) }
-            ?.takeIf { it.isNotEmpty() }
-    }
-}
-
-@JsonAdapter(CastMemberDeserializer::class)
-data class CastMember(val name: String, val character: String?, val profilePath: String?)
-
-class CastMemberDeserializer : JsonDeserializer<CastMember> {
-    override fun deserialize(json: JsonElement, typeOfT: Type, context: com.google.gson.JsonDeserializationContext): CastMember {
-        return castMemberFromJson(json)
-    }
-}
-data class MetaLink(val name: String, val category: String, val url: String)
-data class Video(
+@Serializable(with = MetaDetailSerializer::class)
+data class MetaDetail(
     val id: String,
-    @SerializedName(value = "name", alternate = ["title"]) val name: String?,
-    val season: Int?,
-    @SerializedName(value = "number", alternate = ["episode"]) val number: Int?,
-    @SerializedName(value = "released", alternate = ["firstAired"]) val released: String?,
-    val thumbnail: String?,
-    @SerializedName(value = "overview", alternate = ["description"]) val overview: String? = null,
-    val rating: String? = null,
-    val episodeRuntime: Int? = null
+    val type: String,
+    val name: String,
+    val genres: List<String>?,
+    val poster: String?,
+    val background: String?,
+    val logo: String?,
+    val description: String?,
+    val releaseInfo: String?,
+    val released: String? = null,
+    val runtime: String?,
+    val videos: List<Video>?,
+    val trailers: List<DetailTrailer>? = null,
+    val imdbRating: String? = null,
+    val ageRating: String? = null,
+    val ratings: List<MetaRating>? = null,
+    val cast: List<CastMember>? = null,
+    val director: List<String>? = null,
+    val links: List<MetaLink>? = null,
+    val status: String? = null,
+    val seasonsCount: Int? = null,
+    val platforms: List<String>? = null,
+    val awards: String? = null,
+    val originalLanguage: String? = null,
+    val originalName: String? = null,
+    val country: String? = null,
+    val productionCompanies: List<String>? = null,
+    val networks: List<String>? = null,
+    val collectionName: String? = null,
+    val collectionId: Int? = null,
+    val collectionParts: List<Meta>? = null,
+    val seasonPosters: Map<String, String>? = null,
+    val appExtras: AppExtras? = null
 )
 
+@Serializable
 data class Meta(
     val id: String,
-    val name: String, 
-    val type: String, 
-    val poster: String?, 
-    val background: String? = null, 
-    val logo: String? = null, 
-    val description: String? = null, 
+    val name: String,
+    val type: String,
+    val poster: String?,
+    val background: String? = null,
+    val logo: String? = null,
+    val description: String? = null,
     val imdbRating: String? = null,
     val ageRating: String? = null,
     val ratings: List<MetaRating>? = null,
@@ -180,40 +137,98 @@ data class Meta(
     val reason: String? = null,
     val homeBadge: String? = null,
     val originalLanguage: String? = null,
-    val originalName: String? = null, // TMDB original_name for CS3 multi-search
+    val originalName: String? = null,
     val continueWatchingPoster: String? = null,
     val continueWatchingBackground: String? = null,
     val focusGifUrl: String? = null,
     val coverEmoji: String? = null,
     val hideTitle: Boolean? = null,
     val focusGlowEnabled: Boolean? = null,
-    @SerializedName(value = "videos", alternate = ["episodes"]) val videos: List<Video>? = null,
+    @SerialName("videos") val videos: List<Video>? = null,
     val trailers: List<DetailTrailer>? = null,
     val seasonPosters: Map<String, String>? = null
 )
 
 private fun JsonElement?.safeString(): String? {
-    val element = this?.takeIf { !it.isJsonNull } ?: return null
-    return if (element.isJsonPrimitive) element.asJsonPrimitive.asString else null
+    val element = this?.takeUnless { it is JsonNull } ?: return null
+    return (element as? JsonPrimitive)?.takeIf { it.isString || it.contentOrNull != null }?.content
 }
 
 private fun JsonElement?.asObjectOrNull(): JsonObject? {
-    val element = this?.takeIf { !it.isJsonNull } ?: return null
-    return if (element.isJsonObject) element.asJsonObject else null
+    val element = this?.takeUnless { it is JsonNull } ?: return null
+    return element as? JsonObject
 }
 
 private fun JsonObject.first(vararg keys: String): JsonElement? =
-    keys.firstNotNullOfOrNull { key -> get(key)?.takeIf { !it.isJsonNull } }
+    keys.firstNotNullOfOrNull { key -> get(key)?.takeUnless { it is JsonNull } }
 
 private fun JsonObject.text(vararg keys: String): String? =
     first(*keys)?.safeString()?.trim()?.takeIf { it.isNotBlank() }
 
+private fun JsonObject.int(vararg keys: String): Int? {
+    val value = first(*keys)?.safeString()?.trim()?.takeIf { it.isNotBlank() } ?: return null
+    return value.toIntOrNull() ?: value.toDoubleOrNull()?.toInt()
+}
+
+private fun JsonObject.stringList(vararg keys: String): List<String>? {
+    val value = first(*keys) ?: return null
+    return when (value) {
+        is JsonArray -> value
+            .mapNotNull { it.safeString()?.trim()?.takeIf(String::isNotBlank) }
+            .takeIf { it.isNotEmpty() }
+        else -> value.safeString()
+            ?.split(',')
+            ?.mapNotNull { it.trim().takeIf(String::isNotBlank) }
+            ?.takeIf { it.isNotEmpty() }
+    }
+}
+
+private fun JsonObject.stringMap(vararg keys: String): Map<String, String>? {
+    val value = first(*keys) ?: return null
+    return when (value) {
+        is JsonObject -> value.entries
+            .mapNotNull { entry -> entry.value.safeString()?.takeIf(String::isNotBlank)?.let { entry.key to it } }
+            .toMap()
+            .takeIf { it.isNotEmpty() }
+        is JsonArray -> value
+            .mapIndexedNotNull { index, item -> item.safeString()?.takeIf(String::isNotBlank)?.let { index.toString() to it } }
+            .toMap()
+            .takeIf { it.isNotEmpty() }
+        else -> null
+    }
+}
+
+private fun JsonObject.objectList(vararg keys: String): List<JsonObject> {
+    val value = first(*keys) ?: return emptyList()
+    return when (value) {
+        is JsonArray -> value.mapNotNull { it.asObjectOrNull() }
+        is JsonObject -> listOf(value)
+        else -> emptyList()
+    }
+}
+
+private fun JsonObject.videoList(vararg keys: String): List<Video>? =
+    objectList(*keys).mapNotNull { obj ->
+        val id = obj.text("id") ?: return@mapNotNull null
+        Video(
+            id = id,
+            name = obj.text("name", "title"),
+            season = obj.int("season"),
+            number = obj.int("number", "episode"),
+            released = obj.text("released", "firstAired"),
+            thumbnail = obj.text("thumbnail"),
+            overview = obj.text("overview", "description"),
+            rating = obj.text("rating"),
+            episodeRuntime = obj.int("episodeRuntime", "runtime")
+        )
+    }.takeIf { it.isNotEmpty() }
+
 private fun detailTrailerFromJson(json: JsonElement): DetailTrailer {
-    val obj = json.asObjectOrNull() ?: JsonObject().apply {
-        addProperty("source", json.safeString())
+    val obj = json.asObjectOrNull() ?: buildJsonObject {
+        put("source", json.safeString())
     }
     fun text(vararg keys: String): String? = keys.firstNotNullOfOrNull { key ->
-        obj.get(key)?.safeString()?.trim()?.takeIf { it.isNotBlank() }
+        obj[key]?.safeString()?.trim()?.takeIf { it.isNotBlank() }
     }
     val rawSource = text("source")
     val youtubeId = text("ytId") ?: rawSource?.takeUnless { it.startsWith("http://") || it.startsWith("https://") }
@@ -231,14 +246,14 @@ private fun detailTrailerFromJson(json: JsonElement): DetailTrailer {
     )
 }
 
-private fun castMemberFromJson(json: JsonElement): CastMember {
-    if (json.isJsonPrimitive) return CastMember(json.safeString().orEmpty(), null, null)
-    val obj = json.asObjectOrNull() ?: JsonObject()
-    return CastMember(
-        name = obj.castMemberName(),
-        character = obj.text("character", "role", "as"),
-        profilePath = obj.text("profilePath", "profile_path", "photo", "profile", "image", "img")
-    )
+private fun JsonObject.trailerList(): List<DetailTrailer>? {
+    val value = first("trailers") ?: return null
+    val items = when (value) {
+        is JsonArray -> value.toList()
+        else -> listOf(value)
+    }
+    return items.mapNotNull { runCatching { detailTrailerFromJson(it) }.getOrNull() }
+        .takeIf { it.isNotEmpty() }
 }
 
 private fun JsonObject.castMemberName(): String {
@@ -275,84 +290,20 @@ private fun JsonElement.castNameValue(): String? {
     }
 }
 
-private fun JsonObject.int(vararg keys: String): Int? {
-    val value = first(*keys)?.safeString()?.trim()?.takeIf { it.isNotBlank() } ?: return null
-    return value.toIntOrNull() ?: value.toDoubleOrNull()?.toInt()
+private fun castMemberFromJson(json: JsonElement): CastMember {
+    if (json is JsonPrimitive && json.isString) return CastMember(json.content, null, null)
+    val obj = json.asObjectOrNull() ?: return CastMember("", null, null)
+    return CastMember(
+        name = obj.castMemberName(),
+        character = obj.text("character", "role", "as"),
+        profilePath = obj.text("profilePath", "profile_path", "photo", "profile", "image", "img")
+    )
 }
 
-private fun JsonObject.stringList(vararg keys: String): List<String>? {
-    val value = first(*keys) ?: return null
-    return when {
-        value.isJsonArray -> value.asJsonArray
-            .mapNotNull { it.safeString()?.trim()?.takeIf(String::isNotBlank) }
-            .takeIf { it.isNotEmpty() }
-        else -> value.safeString()
-            ?.split(',')
-            ?.mapNotNull { it.trim().takeIf(String::isNotBlank) }
-            ?.takeIf { it.isNotEmpty() }
-    }
-}
-
-private fun JsonObject.stringMap(vararg keys: String): Map<String, String>? {
-    val value = first(*keys) ?: return null
-    return when {
-        value.isJsonObject -> value.asJsonObject.entrySet()
-            .mapNotNull { entry -> entry.value.safeString()?.takeIf(String::isNotBlank)?.let { entry.key to it } }
-            .toMap()
-            .takeIf { it.isNotEmpty() }
-        value.isJsonArray -> value.asJsonArray
-            .mapIndexedNotNull { index, item -> item.safeString()?.takeIf(String::isNotBlank)?.let { index.toString() to it } }
-            .toMap()
-            .takeIf { it.isNotEmpty() }
-        else -> null
-    }
-}
-
-private fun JsonObject.objectList(vararg keys: String): List<JsonObject> {
-    val value = first(*keys) ?: return emptyList()
-    return when {
-        value.isJsonArray -> value.asJsonArray.mapNotNull { it.asObjectOrNull() }
-        value.isJsonObject -> listOf(value.asJsonObject)
-        else -> emptyList()
-    }
-}
-
-private fun JsonObject.videoList(vararg keys: String): List<Video>? =
-    objectList(*keys).mapNotNull { obj ->
-        val id = obj.text("id") ?: return@mapNotNull null
-        Video(
-            id = id,
-            name = obj.text("name", "title"),
-            season = obj.int("season"),
-            number = obj.int("number", "episode"),
-            released = obj.text("released", "firstAired"),
-            thumbnail = obj.text("thumbnail"),
-            overview = obj.text("overview", "description"),
-            rating = obj.text("rating"),
-            episodeRuntime = obj.int("episodeRuntime", "runtime")
-        )
-    }.takeIf { it.isNotEmpty() }
-
-private fun JsonObject.trailerList(): List<DetailTrailer>? {
-    val value = first("trailers") ?: return null
-    val items = when {
-        value.isJsonArray -> value.asJsonArray.toList()
-        else -> listOf(value)
-    }
-    return items.mapNotNull { runCatching { detailTrailerFromJson(it) }.getOrNull() }
-        .takeIf { it.isNotEmpty() }
-}
-
-private fun JsonObject.ratingList(): List<MetaRating>? =
-    objectList("ratings").mapNotNull { obj ->
-        val source = obj.text("source") ?: return@mapNotNull null
-        MetaRating(source = source, value = obj.first("value")?.safeString())
-    }.takeIf { it.isNotEmpty() }
-
 private fun JsonObject.castList(vararg keys: String): List<CastMember>? {
     val value = first(*keys) ?: return null
-    val items = when {
-        value.isJsonArray -> value.asJsonArray.toList()
+    val items = when (value) {
+        is JsonArray -> value.toList()
         else -> listOf(value)
     }
     return items.mapNotNull { runCatching { castMemberFromJson(it) }.getOrNull() }
@@ -368,12 +319,18 @@ private fun JsonObject.linkList(): List<MetaLink>? =
         MetaLink(name, category, url)
     }.takeIf { it.isNotEmpty() }
 
+private fun JsonObject.ratingList(): List<MetaRating>? =
+    objectList("ratings").mapNotNull { obj ->
+        val source = obj.text("source") ?: return@mapNotNull null
+        MetaRating(source = source, value = obj.first("value")?.safeString())
+    }.takeIf { it.isNotEmpty() }
+
 private fun JsonObject.appExtras(): AppExtras? {
     val obj = first("app_extras", "appExtras").asObjectOrNull() ?: return null
     return AppExtras(
         seasonPosters = obj.first("seasonPosters")?.let { value ->
-            when {
-                value.isJsonArray -> value.asJsonArray.map { it.safeString() }
+            when (value) {
+                is JsonArray -> value.map { it.safeString() }
                 else -> listOf(value.safeString())
             }
         },
@@ -382,3 +339,129 @@ private fun JsonObject.appExtras(): AppExtras? {
         cast = obj.castList("cast")
     )
 }
+
+private fun metaDetailFromJson(json: JsonElement): MetaDetail {
+    val obj = json.asObjectOrNull() ?: JsonObject(emptyMap())
+    return MetaDetail(
+        id = obj.text("id").orEmpty(),
+        type = obj.text("type").orEmpty(),
+        name = obj.text("name").orEmpty(),
+        genres = obj.stringList("genres"),
+        poster = obj.text("poster"),
+        background = obj.text("background"),
+        logo = obj.text("logo"),
+        description = obj.text("description"),
+        releaseInfo = obj.text("releaseInfo", "year"),
+        released = obj.text("released"),
+        runtime = obj.text("runtime"),
+        videos = obj.videoList("videos", "episodes"),
+        trailers = obj.trailerList(),
+        imdbRating = obj.text("imdbRating", "imdb_rating"),
+        ageRating = obj.text("ageRating", "age_rating"),
+        ratings = obj.ratingList(),
+        cast = obj.castList("cast"),
+        director = obj.stringList("director"),
+        links = obj.linkList(),
+        status = obj.text("status"),
+        seasonsCount = obj.int("seasonsCount", "seasons_count"),
+        platforms = obj.stringList("platforms"),
+        awards = obj.text("awards"),
+        originalLanguage = obj.text("originalLanguage", "original_language"),
+        originalName = obj.text("originalName", "original_name"),
+        country = obj.text("country"),
+        productionCompanies = obj.stringList("productionCompanies", "production_companies"),
+        networks = obj.stringList("networks"),
+        collectionName = obj.text("collectionName", "collection_name"),
+        collectionId = obj.int("collectionId", "collection_id"),
+        collectionParts = null,
+        seasonPosters = obj.stringMap("seasonPosters", "season_posters"),
+        appExtras = obj.appExtras()
+    )
+}
+
+object CastMemberSerializer : KSerializer<CastMember> {
+    override val descriptor: SerialDescriptor = PrimitiveSerialDescriptor("CastMember", PrimitiveKind.STRING)
+
+    override fun serialize(encoder: Encoder, value: CastMember) {
+        val json = encoder as? JsonEncoder ?: error("CastMember can only be serialized to JSON")
+        json.encodeJsonElement(buildJsonObject {
+            put("name", value.name)
+            value.character?.let { put("character", it) }
+            value.profilePath?.let { put("profilePath", it) }
+        })
+    }
+
+    override fun deserialize(decoder: Decoder): CastMember {
+        val json = decoder as? JsonDecoder ?: error("CastMember can only be deserialized from JSON")
+        return castMemberFromJson(json.decodeJsonElement())
+    }
+}
+
+object DetailTrailerSerializer : KSerializer<DetailTrailer> {
+    override val descriptor: SerialDescriptor = PrimitiveSerialDescriptor("DetailTrailer", PrimitiveKind.STRING)
+
+    override fun serialize(encoder: Encoder, value: DetailTrailer) {
+        val json = encoder as? JsonEncoder ?: error("DetailTrailer can only be serialized to JSON")
+        json.encodeJsonElement(buildJsonObject {
+            put("id", value.id)
+            put("title", value.title)
+            put("type", value.type)
+            put("url", value.url)
+            value.thumbnail?.let { put("thumbnail", it) }
+            put("source", value.source)
+        })
+    }
+
+    override fun deserialize(decoder: Decoder): DetailTrailer {
+        val json = decoder as? JsonDecoder ?: error("DetailTrailer can only be deserialized from JSON")
+        return detailTrailerFromJson(json.decodeJsonElement())
+    }
+}
+
+object MetaDetailSerializer : KSerializer<MetaDetail> {
+    override val descriptor: SerialDescriptor = PrimitiveSerialDescriptor("MetaDetail", PrimitiveKind.STRING)
+
+    override fun serialize(encoder: Encoder, value: MetaDetail) {
+        val json = encoder as? JsonEncoder ?: error("MetaDetail can only be serialized to JSON")
+        val jsonInstance = json.json
+        json.encodeJsonElement(buildJsonObject {
+            put("id", value.id)
+            put("type", value.type)
+            put("name", value.name)
+            value.genres?.let { put("genres", jsonInstance.encodeToJsonElement(it)) }
+            value.poster?.let { put("poster", it) }
+            value.background?.let { put("background", it) }
+            value.logo?.let { put("logo", it) }
+            value.description?.let { put("description", it) }
+            value.releaseInfo?.let { put("releaseInfo", it) }
+            value.released?.let { put("released", it) }
+            value.runtime?.let { put("runtime", it) }
+            value.videos?.let { put("videos", jsonInstance.encodeToJsonElement(it)) }
+            value.trailers?.let { put("trailers", jsonInstance.encodeToJsonElement(it)) }
+            value.imdbRating?.let { put("imdbRating", it) }
+            value.ageRating?.let { put("ageRating", it) }
+            value.ratings?.let { put("ratings", jsonInstance.encodeToJsonElement(it)) }
+            value.cast?.let { put("cast", jsonInstance.encodeToJsonElement(it)) }
+            value.director?.let { put("director", jsonInstance.encodeToJsonElement(it)) }
+            value.links?.let { put("links", jsonInstance.encodeToJsonElement(it)) }
+            value.status?.let { put("status", it) }
+            value.seasonsCount?.let { put("seasonsCount", it) }
+            value.platforms?.let { put("platforms", jsonInstance.encodeToJsonElement(it)) }
+            value.awards?.let { put("awards", it) }
+            value.originalLanguage?.let { put("originalLanguage", it) }
+            value.originalName?.let { put("originalName", it) }
+            value.country?.let { put("country", it) }
+            value.productionCompanies?.let { put("productionCompanies", jsonInstance.encodeToJsonElement(it)) }
+            value.networks?.let { put("networks", jsonInstance.encodeToJsonElement(it)) }
+            value.collectionName?.let { put("collectionName", it) }
+            value.collectionId?.let { put("collectionId", it) }
+            value.seasonPosters?.let { put("seasonPosters", jsonInstance.encodeToJsonElement(it)) }
+            value.appExtras?.let { put("appExtras", jsonInstance.encodeToJsonElement(it)) }
+        })
+    }
+
+    override fun deserialize(decoder: Decoder): MetaDetail {
+        val json = decoder as? JsonDecoder ?: error("MetaDetail can only be deserialized from JSON")
+        return metaDetailFromJson(json.decodeJsonElement())
+    }
+}

data/src/main/java/com/fluxa/app/data/remote/StremioModels.kt

@@ -27,7 +27,6 @@ data class LibraryItemState(
 )
 
 data class CatalogResponse(val metas: List<Meta>? = null)
-data class MetaDetailResponse(val meta: MetaDetail? = null)
 data class StreamResponse(val streams: List<Stream>? = null)
 
 data class SubtitleResponse(val subtitles: List<SubtitleData>? = null) // Stremio format

data/src/main/java/com/fluxa/app/data/remote/StremioService.kt

@@ -44,7 +44,7 @@ interface StremioService {
     suspend fun getCatalogWithGenre(@Path("type") type: String, @Path("id") id: String, @Path("genre") genre: String): CatalogResponse
 
     @GET("meta/{type}/{id}.json")
-    suspend fun getMetaDetail(@Path("type") type: String, @Path("id") id: String): MetaDetailResponse
+    suspend fun getMetaDetail(@Path("type") type: String, @Path("id") id: String): okhttp3.ResponseBody
 
     @GET
     suspend fun getStreams(@Url url: String): StreamResponse

data/src/main/java/com/fluxa/app/data/repository/StremioAddonResourceClient.kt

@@ -6,8 +6,6 @@ import com.fluxa.app.core.rust.models.NativeAddonFetchResult
 import okhttp3.Request
 import com.fluxa.app.data.remote.AddonDescriptor
 import com.fluxa.app.data.remote.AuthRequest
-import com.fluxa.app.data.remote.CastMember
-import com.fluxa.app.data.remote.CastMemberDeserializer
 import com.fluxa.app.data.remote.Meta
 import com.fluxa.app.data.remote.MetaDetail
 import com.fluxa.app.data.remote.MetaDetailResponse
@@ -28,6 +26,9 @@ import kotlinx.coroutines.withContext
 import kotlinx.coroutines.withTimeoutOrNull
 import kotlinx.coroutines.sync.Mutex
 import kotlinx.coroutines.sync.withLock
+import kotlinx.serialization.SerializationException
+import kotlinx.serialization.decodeFromString
+import kotlinx.serialization.json.Json
 import okhttp3.OkHttpClient
 import java.io.IOException
 import java.lang.reflect.Type
@@ -44,11 +45,9 @@ class StremioAddonResourceClient @Inject constructor(
     private val addonManifestClient: StremioAddonManifestClient,
     @param:Named("AddonResourceClient") private val httpClient: OkHttpClient
 ) {
-    private val stremioGson = GsonBuilder()
-        .registerTypeAdapter(CastMember::class.java, CastMemberDeserializer())
-        .create()
+    private val stremioGson = GsonBuilder().create()
+    private val stremioJson = Json { ignoreUnknownKeys = true; isLenient = true; coerceInputValues = true }
     private val streamListType = object : TypeToken<List<Stream>>() {}.type
-    private val metaListType = object : TypeToken<List<Meta>>() {}.type
     private val subtitleListType = object : TypeToken<List<SubtitleData>>() {}.type
     private val userAddonsLocks = ConcurrentHashMap<String, Mutex>()
 
@@ -61,7 +60,7 @@ class StremioAddonResourceClient @Inject constructor(
             .map(addonManifestClient::normalizeAddonTransportUrl)
             .filter { it.isNotBlank() }
             .distinctBy(StremioAddonUrls::identity)
-        val cacheKey = "addons_v9_${authKey}_${normalizedLocalAddons.joinToString("|")}"
+        val cacheKey = "addons_v10_${authKey}_${normalizedLocalAddons.joinToString("|")}"
         if (!forceRefresh) {
             cache.get<List<AddonDescriptor>>(cacheKey)?.let { return@withContext it }
             persistentCache.getUserAddons(cacheKey).takeIf { it.isNotEmpty() }?.let {
@@ -88,9 +87,9 @@ class StremioAddonResourceClient @Inject constructor(
                             val liveManifest = withTimeoutOrNull(3000) {
                                 addonManifestClient.getAddonManifest(addon.transportUrl, forceRefresh)
                             }
-                            addAddon(with(addonManifestClient) { addon.mergeLiveManifest(liveManifest) })
+                            with(addonManifestClient) { addon.mergeLiveManifest(liveManifest) }
                         }
-                    }.awaitAll()
+                    }.awaitAll().forEach(::addAddon)
                 } catch (e: Exception) {
                     Log.w("StremioRepository", "Failed to load user addons", e)
                 }
@@ -100,12 +99,13 @@ class StremioAddonResourceClient @Inject constructor(
                     try {
                         withTimeoutOrNull(3000) {
                             addonManifestClient.getAddonManifest(url, forceRefresh)
-                        }?.let(::addAddon)
+                        }
                     } catch (e: Exception) {
                         Log.w("StremioRepository", "Failed to load local addon manifest: $url", e)
+                        null
                     }
                 }
-            }.awaitAll()
+            }.awaitAll().filterNotNull().forEach(::addAddon)
             allAddons.toList().ifEmpty {
                 persistentCache.getUserAddons(cacheKey)
             }.also {
@@ -250,13 +250,26 @@ class StremioAddonResourceClient @Inject constructor(
             fallbackUrl = addonManifestClient.buildAddonResourceUrl(transportUrl, "catalog", type, id, extraArgs)
         )
         val success = parsed as? AddonResourceResult.Success ?: return@withContext parsed.toTypedEmpty()
-        val result = decodeResourceList<Meta>(result = success, type = metaListType)
+        val result = decodeMetaList(success)
         if (result is AddonResourceResult.Success) {
             cache.put(cacheKey, result.value)
         }
         result
     }
 
+    private fun decodeMetaList(result: AddonResourceResult.Success<String>): AddonResourceResult<List<Meta>> {
+        return try {
+            val items = stremioJson.decodeFromString<List<Meta>>(result.value)
+            if (items.isEmpty()) AddonResourceResult.Empty(result.url) else AddonResourceResult.Success(items, result.url)
+        } catch (e: SerializationException) {
+            AddonResourceResult.ParseError(result.url, e)
+        } catch (e: IOException) {
+            AddonResourceResult.NetworkError(result.url, e)
+        } catch (e: Exception) {
+            AddonResourceResult.NetworkError(result.url, e)
+        }
+    }
+
     private fun <T> decodeResourceList(
         result: AddonResourceResult.Success<String>,
         type: Type,
@@ -285,7 +298,7 @@ class StremioAddonResourceClient @Inject constructor(
                 ?.applyLinks()
                 ?.let { AddonResourceResult.Success(it, result.url) }
                 ?: AddonResourceResult.Empty(result.url)
-        } catch (e: JsonParseException) {
+        } catch (e: SerializationException) {
             AddonResourceResult.ParseError(result.url, e)
         } catch (e: IOException) {
             AddonResourceResult.NetworkError(result.url, e)
@@ -295,8 +308,8 @@ class StremioAddonResourceClient @Inject constructor(
     }
 
     private fun decodeMetaDetailPayload(json: String): MetaDetail? {
-        return stremioGson.fromJson(json, MetaDetailResponse::class.java)?.meta
-            ?: stremioGson.fromJson(json, MetaDetail::class.java)
+        return runCatching { stremioJson.decodeFromString<MetaDetailResponse>(json) }.getOrNull()?.meta
+            ?: runCatching { stremioJson.decodeFromString<MetaDetail>(json) }.getOrNull()
     }
 
     private fun MetaDetail.applyAppExtras(): MetaDetail {

data/src/main/java/com/fluxa/app/data/repository/StremioRepository.kt

@@ -8,12 +8,16 @@ import com.fluxa.app.domain.discovery.*
 import android.util.Log
 import com.fluxa.app.data.BuildConfig
 import kotlinx.coroutines.*
+import kotlinx.serialization.decodeFromString
+import kotlinx.serialization.json.Json
 import java.text.SimpleDateFormat
 import java.util.Date
 import java.util.Locale
 import javax.inject.Inject
 import javax.inject.Singleton
 
+private val stremioMetaJson = Json { ignoreUnknownKeys = true; isLenient = true; coerceInputValues = true }
+
 @Singleton
 class StremioRepository @Inject constructor(
     private val authService: StremioService, 
@@ -91,7 +95,12 @@ class StremioRepository @Inject constructor(
             Log.d("MetaFetch", "getMetaDetail fromAddon: ${if (fromAddon != null) "OK name=${fromAddon.name}" else "NULL"}")
             fromAddon?.let { return it }
         }
-        return if (plan.fallbackToStremioMetaDetail) authService.getMetaDetail(type, id).meta else null
+        return if (plan.fallbackToStremioMetaDetail) {
+            val body = authService.getMetaDetail(type, id).string()
+            runCatching { stremioMetaJson.decodeFromString<MetaDetailResponse>(body) }.getOrNull()?.meta
+        } else {
+            null
+        }
     }
 
     suspend fun getAddonMetaDetail(