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, 56 insertions, 0 deletions

diff --git a/player-android/lib/screens/video_player_screen.dart b/player-android/lib/screens/video_player_screen.dart
new file mode 100644
index 0000000..280a4b9
--- /dev/null
+++ b/player-android/lib/screens/video_player_screen.dart
@@ -0,0 +1,56 @@
+// ignore_for_file: unused_import
+// The chewie and video_player imports are intentionally present even in this
+// placeholder so that package resolution is verified at analysis time and the
+// import graph is established before feature implementation begins.
+import 'package:chewie/chewie.dart';
+import 'package:flutter/material.dart';
+import 'package:video_player/video_player.dart';
+
+/// Placeholder video player screen — full implementation is deferred.
+///
+/// Accepts [mediaId] (the route path parameter) and [mediaUrl] (the resolved
+/// stream URL, passed as route extra) so the router wiring is established and
+/// the package imports are verified before feature work begins.
+///
+/// TODO(video-player): Convert to [StatefulWidget].  In [State.initState]
+///   create [VideoPlayerController.networkUrl] from [mediaUrl], then wrap it
+///   in a [ChewieController] with `aspectRatio`, `autoPlay`, etc.  Dispose
+///   both controllers in [State.dispose].
+///   See: https://pub.dev/packages/chewie
+///        https://pub.dev/packages/video_player
+class VideoPlayerScreen extends StatelessWidget {
+  const VideoPlayerScreen({
+    super.key,
+    required this.mediaId,
+    this.mediaUrl,
+  });
+
+  /// The media item identifier extracted from the '/video/:mediaId' route path.
+  final String mediaId;
+
+  /// The resolved HLS/direct stream URL, optionally provided as a route extra.
+  /// Will be required once real playback is wired up.
+  final String? mediaUrl;
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(title: Text('Video – $mediaId')),
+      body: const Center(
+        child: Column(
+          mainAxisSize: MainAxisSize.min,
+          children: [
+            Icon(Icons.videocam_outlined, size: 64),
+            SizedBox(height: 16),
+            Text('Video player TODO', style: TextStyle(fontSize: 18)),
+            SizedBox(height: 8),
+            Text(
+              'Will use video_player + chewie for playback controls.',
+              textAlign: TextAlign.center,
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+}