feat(client): 对接详情/播放/进度续看/收藏（K1 看剧闭环）+ 三态 UI

后端接口从 6 个扩到 13 个，全部走真数据：

- 新增 api：playback_api（/app/episodes/{id}/play）、watch_api（/app/watch/*）、
  library_api（/app/favorites*）；票据从 CatalogApi 搬到 PlaybackApi
- 新增 repository：PlaybackRepository（含票据 TTL 缓存，默认 10 分钟，时钟可注入）、
  FavoriteRepository、WatchHistoryRepository 换成服务端模型（每剧一条续看记录，删掉 demoProfileId）
- PlayerLogic：起播前取票（拿不到给三态 UI，失败可重试）；accessType 驱动锁定文案，
  不在前端猜；签名地址原样交给播放器（只补 host，不动 path/query）；
  进度上报节流 5s → 10s，切集/退出/切后台各补一次，播完带 finished
- 续看定位：服务端记录里的那一集才 seek（其它集从头播），续看位置进详情/播放页时读一次
- FavoriteController：收藏以服务端为准，乐观更新 + 失败回滚；退出登录清空
- UI 三态：详情页（加载/失败可重试/空剧集 + 续看进度条 + 收藏按钮）、
  播放页（票据加载中/失败可重试/后端判定不可播）、我的页（续看失败可重试、收藏三态、最近观看）
- l10n 新增 8 个键（en/zh/id 三份）：网络/进度/收藏失败、锁定提示、续看文案等

测试：flutter test 188 全过（存量 27 个测试文件未跑红）；新增票据过期重取、进度节流、
续看定位、收藏回滚、签名 query 原样保留、真实后端端到端联调（live_watch_flow）

lib/app.dart

@@ -1,3 +1,5 @@
+import 'dart:async';
+
 import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
 
@@ -5,12 +7,19 @@ import 'core/config/locale_controller.dart';
 import 'core/data/remote/api_client.dart';
 import 'core/data/remote/auth_api.dart';
 import 'core/data/remote/catalog_api.dart';
+import 'core/data/remote/library_api.dart';
+import 'core/data/remote/playback_api.dart';
+import 'core/data/remote/watch_api.dart';
 import 'core/data/repositories/catalog_repository.dart';
 import 'core/data/repositories/engagement_repository.dart';
+import 'core/data/repositories/favorite_repository.dart';
+import 'core/data/repositories/playback_repository.dart';
+import 'core/data/repositories/watch_history_repository.dart';
 import 'core/data/services/auth_controller.dart';
 import 'core/data/services/auth_session_store.dart';
 import 'core/data/services/catalog_controller.dart';
 import 'core/data/services/engagement_controller.dart';
+import 'core/data/services/favorite_controller.dart';
 import 'core/data/services/playback_session.dart';
 import 'core/data/services/video_player_port.dart';
 import 'l10n/app_localizations.dart';
@@ -21,12 +30,18 @@ class LumaDramaApp extends StatefulWidget {
     super.key,
     this.playerFactory = VideoPlayerPort.new,
     this.catalogRepository,
+    this.watchHistoryRepository,
+    this.favoriteRepository,
+    this.playbackRepository,
   });
 
   final PlayerFactory playerFactory;
 
   /// 测试注入用；生产走 HTTP 仓库。
   final CatalogRepository? catalogRepository;
+  final WatchHistoryRepository? watchHistoryRepository;
+  final FavoriteRepository? favoriteRepository;
+  final PlaybackRepository? playbackRepository;
 
   @override
   State<LumaDramaApp> createState() => _LumaDramaAppState();
@@ -46,11 +61,53 @@ class _LumaDramaAppState extends State<LumaDramaApp> {
 
   late final AuthController _auth = AuthController(AuthApi(_apiClient), _sessionStore);
 
+  late final WatchHistoryRepository _watchHistory =
+      widget.watchHistoryRepository ??
+      HttpWatchHistoryRepository(
+        WatchApi(_apiClient),
+        isSignedIn: () => _auth.isSignedIn,
+      );
+
+  late final FavoriteRepository _favorites =
+      widget.favoriteRepository ??
+      HttpFavoriteRepository(
+        LibraryApi(_apiClient),
+        isSignedIn: () => _auth.isSignedIn,
+      );
+
+  late final PlaybackRepository _playback =
+      widget.playbackRepository ?? HttpPlaybackRepository(PlaybackApi(_apiClient));
+
+  late final FavoriteController _favoriteController = FavoriteController(_favorites);
+
   @override
   void initState() {
     super.initState();
     // 恢复本地令牌与设备号；未登录也能正常浏览，不阻塞首屏
     _auth.load();
+    // 登录/登出时同步收藏状态：收藏属于账号，不能跨账号串联
+    _auth.addListener(_onAuthChanged);
+    if (_auth.isSignedIn) unawaited(_favoriteController.load());
+  }
+
+  bool _wasSignedIn = false;
+
+  void _onAuthChanged() {
+    if (_auth.isSignedIn == _wasSignedIn) return;
+    _wasSignedIn = _auth.isSignedIn;
+    if (_auth.isSignedIn) {
+      unawaited(_favoriteController.load());
+    } else {
+      _favoriteController.clear();
+    }
+  }
+
+  @override
+  void dispose() {
+    _auth.removeListener(_onAuthChanged);
+    _favoriteController.dispose();
+    _apiClient.close();
+    super.dispose();
   }
 
   @override
@@ -59,12 +116,16 @@ class _LumaDramaAppState extends State<LumaDramaApp> {
       providers: [
         Provider(create: (_) => PlaybackCoordinator()),
         Provider<PlayerFactory>(create: (_) => widget.playerFactory),
+        Provider<PlaybackRepository>.value(value: _playback),
+        Provider<WatchHistoryRepository>.value(value: _watchHistory),
+        Provider<FavoriteRepository>.value(value: _favorites),
         ChangeNotifierProvider(
           create: (_) => CatalogController(
             widget.catalogRepository ?? HttpCatalogRepository(CatalogApi(_apiClient)),
           )..load(),
         ),
         ChangeNotifierProvider(create: (_) => LocaleController()..load()),
+        ChangeNotifierProvider.value(value: _favoriteController),
         ChangeNotifierProvider(
           create: (_) =>
               EngagementController(SharedPreferencesEngagementRepository())