Add video/audio player packages, routes, and placeholder screens (task xa)

- pubspec.yaml: add video_player ^2.9.2, chewie ^1.8.5, just_audio ^0.9.42,
  audio_service ^0.18.15 with descriptive comments explaining each package's role.
- AndroidManifest.xml: add FOREGROUND_SERVICE, FOREGROUND_SERVICE_MEDIA_PLAYBACK,
  and WAKE_LOCK permissions; declare AudioService with foregroundServiceType=
  mediaPlayback and MediaButtonReceiver for hardware media button support.
  INTERNET was already present — not duplicated.
- app_routes.dart: add videoPlayer (/video/:mediaId) and audioPlayer
  (/audio/:mediaId) route constants plus videoPlayerPath/audioPlayerPath helpers.
- router.dart: wire GoRoutes for the two new paths, forwarding mediaId from
  path params and optional mediaUrl from route extra.
- screens/video_player_screen.dart: placeholder VideoPlayerScreen accepting
  mediaId + mediaUrl, importing chewie and video_player for resolution check.
- screens/audio_player_screen.dart: placeholder AudioPlayerScreen accepting
  mediaId + mediaUrl, importing just_audio and audio_service for resolution check.

flutter pub get and flutter analyze both pass clean.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

1 files changed, 31 insertions, 0 deletions

diff --git a/player-android/android/app/src/main/AndroidManifest.xml b/player-android/android/app/src/main/AndroidManifest.xml
index 4ca1088..602051c 100644
--- a/player-android/android/app/src/main/AndroidManifest.xml
+++ b/player-android/android/app/src/main/AndroidManifest.xml
@@ -1,5 +1,13 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android">
+    <!-- Required for all network calls (API, streaming). -->
     <uses-permission android:name="android.permission.INTERNET" />
+    <!-- Required by audio_service to keep audio playing when the app is in the
+         background.  Without this the OS may kill the media playback process. -->
+    <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
+    <!-- Required to declare mediaPlayback foreground service type on API 34+. -->
+    <uses-permission android:name="android.permission.FOREGROUND_SERVICE_MEDIA_PLAYBACK" />
+    <!-- Prevents the CPU from sleeping while audio is actively playing. -->
+    <uses-permission android:name="android.permission.WAKE_LOCK" />
 
     <application
         android:label="Player"
@@ -25,5 +33,28 @@
         <meta-data
             android:name="flutterEmbedding"
             android:value="2" />
+        <!-- audio_service background playback service.
+             android:foregroundServiceType="mediaPlayback" is mandatory on
+             Android 10+ (API 29+) to grant media-playback foreground service
+             privileges.  This overrides the entry auto-merged from
+             audio_service's own manifest to explicitly pin the foreground
+             service type.  Class names match audio_service 0.18.x internals. -->
+        <service
+            android:name="com.ryanheise.audioservice.AudioService"
+            android:exported="true"
+            android:foregroundServiceType="mediaPlayback">
+            <intent-filter>
+                <action android:name="android.media.browse.MediaBrowserService" />
+            </intent-filter>
+        </service>
+        <!-- Receives hardware media button events (headset play/pause, etc.)
+             and forwards them to audio_service. -->
+        <receiver
+            android:name="com.ryanheise.audioservice.MediaButtonReceiver"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.intent.action.MEDIA_BUTTON" />
+            </intent-filter>
+        </receiver>
     </application>
 </manifest>