chore(client): 归档原型阶段未提交改动（binding/logic/view 分层与各页迭代）

为什么：客户端原型在 14d7bd3 之后又做了一轮（页面分层、发现页、分类滑动、播放器控件等），
一直留在工作区没入库。下一批账号链路要改其中的 app.dart / home_view / player_view / mine_view，
先归档这批既存改动，本批的实际 diff 才说得清边界。

只归档，不改行为：当前工作区 flutter analyze 0 问题、flutter test 148 全过。

pubspec.yaml

@@ -34,6 +34,8 @@ dependencies:
   # The following adds the Cupertino Icons font to your application.
   # Use with the CupertinoIcons class for iOS style icons.
   cupertino_icons: ^1.0.8
+  # 只用官方 http：纯 Dart、体积小；不引 dio/代码生成/图片缓存，控制包体积
+  http: ^1.2.2
   provider: ^6.1.5+1
   video_player: ^2.14.0
   shared_preferences: ^2.5.5
@@ -59,13 +61,8 @@ dev_dependencies:
 # The following section is specific to Flutter packages.
 flutter:
   generate: true
-  assets:
-    - assets/media/demo_clip.mp4
-    - assets/images/demo_poster.jpg
-    - assets/images/stitch_signal_poster_clean.png
-    - assets/images/stitch_city_poster_clean.png
-    - assets/images/stitch_vengeance_poster_clean.png
-    - assets/images/stitch_rain_scene.jpg
+  # 封面与视频全部由后端下发（/files/**），本地不再打包演示素材：
+  # 原先 assets/media 下的演示视频有 316MB，会把安装包撑到无法接受的大小。
 
   # The following line ensures that the Material Icons font is
   # included with your application, so that you can use the icons in