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）

test/player/player_logic_test.dart

@@ -2,6 +2,7 @@ import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:fruitshorts/core/data/models/drama.dart';
+import 'package:fruitshorts/core/data/models/play_ticket.dart';
 import 'package:fruitshorts/core/data/models/player_port.dart';
 import 'package:fruitshorts/core/data/services/android_picture_in_picture.dart';
 import 'package:fruitshorts/core/data/services/playback_session.dart';
@@ -9,6 +10,7 @@ import 'package:fruitshorts/pages/player/player_logic.dart';
 import 'package:fruitshorts/pages/player/player_view.dart';
 
 import '../support/fake_watch_history.dart';
+import 'package:fruitshorts/core/data/repositories/playback_repository.dart';
 
 Drama _drama(
   String id, {
@@ -35,8 +37,14 @@ Drama _drama(
 AndroidPictureInPicture _pip() =>
     AndroidPictureInPicture(channel: const MethodChannel('test/player_logic/pip'));
 
-PlayerLogic _logic(FakeWatchHistory history) =>
-    PlayerLogic(history: history, pictureInPicture: _pip());
+PlayerLogic _logic(
+  FakeWatchHistory history, {
+  PlaybackRepository? playback,
+}) => PlayerLogic(
+  history: history,
+  playback: playback ?? FakePlaybackRepository(),
+  pictureInPicture: _pip(),
+);
 
 /// Drains the session's serialized work so a test never ends mid-disposal.
 ///
@@ -191,10 +199,7 @@ void main() {
         const Duration(seconds: 2),
       );
 
-      expect(history.writes, [
-        'demo-local-v1|signal|signal-1|1000',
-        'demo-local-v1|signal|signal-2|2000',
-      ]);
+      expect(history.writes, ['signal-1|1000|false', 'signal-2|2000|false']);
     });
 
     test('should_keep_later_writes_when_an_earlier_write_fails', () async {
@@ -216,7 +221,7 @@ void main() {
         const Duration(seconds: 2),
       );
 
-      expect(history.writes, ['demo-local-v1|signal|signal-2|2000']);
+      expect(history.writes, ['signal-2|2000|false']);
     });
 
     test('should_write_nothing_when_no_player_is_tracked', () async {
@@ -284,7 +289,18 @@ void main() {
     test('should_never_reach_player_factory_when_episode_is_locked', () async {
       final factory = _RecordingFactory();
       final drama = _drama('locked', isFree: false);
-      final logic = _logic(FakeWatchHistory());
+      // 锁定的判定权在后端：票据返回不可播 + 无地址，客户端不得自行推断
+      final logic = _logic(
+        FakeWatchHistory(),
+        playback: FakePlaybackRepository(
+          ticket: const PlayTicket(
+            episodeId: 'locked-1',
+            accessible: false,
+            accessType: PlayTicket.coinRequired,
+            unlockCoin: 30,
+          ),
+        ),
+      );
       logic.attach(
         PlayerPage(drama: drama, initialIndex: 0),
         isMounted: () => true,