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/l10n/app_id.arb

@@ -34,7 +34,13 @@
   "localDemoProfile": "Profil demo lokal",
   "continueWatching": "Lanjut Tonton",
   "watchedPercent": "Sudah ditonton {percent}%",
-  "@watchedPercent": {"placeholders": {"percent": {"type": "int"}}},
+  "@watchedPercent": {
+    "placeholders": {
+      "percent": {
+        "type": "int"
+      }
+    }
+  },
   "resume": "Lanjutkan",
   "history": "Riwayat",
   "watchlist": "Daftar Tonton",
@@ -72,16 +78,40 @@
   "originalTag": "Original",
   "dramaTag": "Drama pendek",
   "episodeLabel": "Episode {number}",
-  "@episodeLabel": {"placeholders": {"number": {"type": "int"}}},
+  "@episodeLabel": {
+    "placeholders": {
+      "number": {
+        "type": "int"
+      }
+    }
+  },
   "exploreSeries": "Lihat serial",
   "episodeCount": "{count} EPISODE",
-  "@episodeCount": {"placeholders": {"count": {"type": "int"}}},
+  "@episodeCount": {
+    "placeholders": {
+      "count": {
+        "type": "int"
+      }
+    }
+  },
   "technicalDemoCount": "PRATINJAU GRATIS · {count} EPISODE",
-  "@technicalDemoCount": {"placeholders": {"count": {"type": "int"}}},
+  "@technicalDemoCount": {
+    "placeholders": {
+      "count": {
+        "type": "int"
+      }
+    }
+  },
   "episodes": "Episode",
   "watchEpisodeOne": "Tonton episode 1",
   "continueEpisode": "Lanjut episode {number}",
-  "@continueEpisode": {"placeholders": {"number": {"type": "int"}}},
+  "@continueEpisode": {
+    "placeholders": {
+      "number": {
+        "type": "int"
+      }
+    }
+  },
   "freeTestMedia": "Klip demo sama · gratis",
   "lockedStoreUnavailable": "Terkunci · toko belum tersedia",
   "freeTestClip": "Klip uji gratis",
@@ -89,10 +119,25 @@
   "freeSamplesNotice": "Dua sampel gratis · pengaturan toko belum selesai",
   "demoTestMedia": "GRATIS · KLIP DEMO SAMA",
   "episodeProgress": "EPISODE {number} / {total}",
-  "@episodeProgress": {"placeholders": {"number": {"type": "int"}, "total": {"type": "int"}}},
+  "@episodeProgress": {
+    "placeholders": {
+      "number": {
+        "type": "int"
+      },
+      "total": {
+        "type": "int"
+      }
+    }
+  },
   "testVideoNotice": "Video uji teknis buatan sendiri",
   "lockedTitle": "Episode {number} terkunci",
-  "@lockedTitle": {"placeholders": {"number": {"type": "int"}}},
+  "@lockedTitle": {
+    "placeholders": {
+      "number": {
+        "type": "int"
+      }
+    }
+  },
   "lockedBody": "Pembukaan kunci tersedia setelah toko dan verifikasi disiapkan. Demo ini tidak memproses pembayaran.",
   "playbackError": "Klip ini tidak bisa diputar.",
   "catalogError": "Katalog gagal dimuat.",
@@ -180,5 +225,19 @@
   "authGateTitle": "Masuk untuk melanjutkan",
   "authGateMessage": "Favorit dan komentar perlu akun.",
   "authGateAction": "Masuk",
-  "cancel": "Nanti saja"
+  "cancel": "Nanti saja",
+  "noEpisodesYet": "Belum ada episode yang bisa diputar.",
+  "networkError": "Jaringan tidak tersedia. Periksa koneksi lalu coba lagi.",
+  "progressError": "Posisi tonton gagal dimuat.",
+  "favoritesError": "Daftar favorit gagal dimuat.",
+  "favoriteToggleFailed": "Gagal memperbarui favorit. Coba lagi.",
+  "remove": "Hapus",
+  "unlockComingSoon": "Pembukaan dengan koin segera hadir.",
+  "resumeProgress": "Lanjut di {position} / {total}",
+  "@resumeProgress": {
+    "placeholders": {
+      "position": {},
+      "total": {}
+    }
+  }
 }