Add Koin as the DI mechanism for shared code

Hilt is Android/Dagger-only and can't run on Kotlin/Native, so it
can't be used for anything moving into :shared. Koin is the standard
KMP alternative — this wires it up for real: a Koin module
(sharedModule) providing GreetingViewModel via the koin viewmodel DSL,
CmpSmokeTest now resolves it through koinViewModel() instead of
constructing it directly, and AppApplication.onCreate() calls
initSharedKoin() at startup so this isn't just compile-checked dead
code — Koin actually starts alongside Hilt (the two coexist fine,
verified by compiling the full app afterward).

This is the pattern for every ViewModel/ScreenModel that moves to
:shared going forward. HomeViewModel/DetailViewModel themselves stay
Hilt-based in app for now — porting them means porting their
repositories to KMP first, which is separate, larger work.

Verified compiling for android, iosArm64, iosSimulatorArm64, and both
app product flavors still build with Koin initialized at startup.

app/src/main/java/com/fluxa/app/AppApplication.kt

@@ -21,6 +21,7 @@ import com.lagradost.cloudstream3.AcraApplication
 import com.lagradost.cloudstream3.app
 import com.fluxa.app.common.AppStrings
 import com.fluxa.app.common.initialize
+import com.fluxa.app.shared.di.initSharedKoin
 import com.fluxa.app.ui.catalog.EpisodeReleaseWorker
 import com.fluxa.app.plugins.PluginAutoUpdateWorker
 import com.fluxa.app.ui.catalog.TrailerResolver
@@ -51,6 +52,7 @@ class AppApplication : Application(), SingletonImageLoader.Factory, Configuratio
         // CloudStream library's app singleton is auto-initialized by the library
 
         AppStrings.initialize(this)
+        initSharedKoin()
         TrailerResolver.init(cacheDir)
         PluginAutoUpdateWorker.enqueue(this)
         EpisodeReleaseWorker.enqueue(this)

gradle/libs.versions.toml

@@ -39,6 +39,7 @@ kotlinMetadataJvm     = "2.4.0"
 kotlinxSerialization  = "1.11.0"
 kotlinxDatetime       = "0.8.0"
 composeMultiplatform  = "1.11.1"
+koin                  = "4.2.2"
 
 [libraries]
 # Build-logic plugin artifacts (compileOnly in build-logic)
@@ -54,6 +55,7 @@ androidx-activity-compose           = { group = "androidx.activity",           n
 androidx-lifecycle-runtime          = { group = "androidx.lifecycle",          name = "lifecycle-runtime-ktx",       version.ref = "lifecycle" }
 androidx-lifecycle-runtime-compose  = { group = "androidx.lifecycle",          name = "lifecycle-runtime-compose",   version.ref = "lifecycle" }
 androidx-lifecycle-viewmodel-compose= { group = "androidx.lifecycle",          name = "lifecycle-viewmodel-compose", version.ref = "lifecycle" }
+androidx-lifecycle-viewmodel        = { group = "androidx.lifecycle",          name = "lifecycle-viewmodel",         version.ref = "lifecycle" }
 androidx-work-runtime               = { group = "androidx.work",               name = "work-runtime-ktx",            version.ref = "workManager" }
 androidx-hilt-work                  = { group = "androidx.hilt",               name = "hilt-work",                   version.ref = "hiltAndroidx" }
 androidx-hilt-compiler              = { group = "androidx.hilt",               name = "hilt-compiler",               version.ref = "hiltAndroidx" }
@@ -124,6 +126,11 @@ kotlin-metadata-jvm   = { group = "org.jetbrains.kotlin", name = "kotlin-metadat
 kotlinx-serialization-json = { group = "org.jetbrains.kotlinx", name = "kotlinx-serialization-json", version.ref = "kotlinxSerialization" }
 kotlinx-datetime           = { group = "org.jetbrains.kotlinx", name = "kotlinx-datetime",           version.ref = "kotlinxDatetime" }
 
+# Koin (multiplatform DI, replaces Hilt in :shared)
+koin-core                  = { group = "io.insert-koin", name = "koin-core",                  version.ref = "koin" }
+koin-compose                = { group = "io.insert-koin", name = "koin-compose",               version.ref = "koin" }
+koin-compose-viewmodel      = { group = "io.insert-koin", name = "koin-compose-viewmodel",      version.ref = "koin" }
+
 # Jackson
 jackson-databind      = { group = "com.fasterxml.jackson.core",   name = "jackson-databind",      version.ref = "jackson" }
 jackson-module-kotlin = { group = "com.fasterxml.jackson.module", name = "jackson-module-kotlin", version.ref = "jackson" }

shared/build.gradle.kts

@@ -12,6 +12,10 @@ kotlin {
             implementation(project(":core"))
             implementation(libs.coil3)
             implementation(libs.coil3.compose)
+            implementation(libs.koin.core)
+            implementation(libs.koin.compose)
+            implementation(libs.koin.compose.viewmodel)
+            implementation(libs.androidx.lifecycle.viewmodel)
         }
     }
 }

shared/src/commonMain/kotlin/com/fluxa/app/shared/CmpSmokeTest.kt

@@ -3,10 +3,13 @@ package com.fluxa.app.shared
 import androidx.compose.foundation.layout.Column
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
+import com.fluxa.app.shared.di.GreetingViewModel
+import org.koin.compose.viewmodel.koinViewModel
 
 @Composable
 fun CmpSmokeTest() {
+    val viewModel = koinViewModel<GreetingViewModel>()
     Column {
-        Text("Fluxa on ${platformName()}")
+        Text(viewModel.greeting)
     }
 }

shared/src/commonMain/kotlin/com/fluxa/app/shared/di/InitKoin.kt

@@ -0,0 +1,9 @@
+package com.fluxa.app.shared.di
+
+import org.koin.core.context.startKoin
+
+fun initSharedKoin() {
+    startKoin {
+        modules(sharedModule)
+    }
+}

shared/src/commonMain/kotlin/com/fluxa/app/shared/di/SharedModule.kt

@@ -0,0 +1,14 @@
+package com.fluxa.app.shared.di
+
+import androidx.lifecycle.ViewModel
+import com.fluxa.app.shared.platformName
+import org.koin.core.module.dsl.viewModel
+import org.koin.dsl.module
+
+class GreetingViewModel : ViewModel() {
+    val greeting: String = "Fluxa on ${platformName()}"
+}
+
+val sharedModule = module {
+    viewModel { GreetingViewModel() }
+}