Exclude the iOS-only plugin repository manager from tvOS, cache Rust on failure

FluxaApplePluginRepositoryManager.swift only has iOS callers and
references the iOS-only FluxaApplePluginsEffectHandler, so it fails to
compile for tvOS the same way the addon-store files already excluded
above do. Add it to the same exclude list.

Also set cache-on-failure on both Swatinem/rust-cache steps: since every
Apple CI run this session failed at a later step, the Rust build cache
was never saved, so each retry recompiled the whole dependency tree
(~15-25 min) from scratch instead of reusing what already built fine.

.github/workflows/apple.yml

@@ -73,6 +73,7 @@ jobs:
         uses: Swatinem/rust-cache@v2
         with:
           workspaces: fluxa-core
+          cache-on-failure: true
 
       - name: Set up XcodeGen
         run: |
@@ -147,6 +148,7 @@ jobs:
         uses: Swatinem/rust-cache@v2
         with:
           workspaces: fluxa-core
+          cache-on-failure: true
 
       - name: Set up XcodeGen
         run: |

appleApp/project.yml

@@ -46,6 +46,7 @@ targets:
           - FluxaAppleAddonStoreManager.swift
           - FluxaAppleCatalogBootstrap.swift
           - FluxaAppleCatalogLoader.swift
+          - FluxaApplePluginRepositoryManager.swift
       - path: tvOS
       - path: Generated/FluxaRustCore.swift
     resources: