feat(player): 接入双端画中画播放

pubspec.yaml

@@ -48,6 +48,10 @@ dependencies:
     sdk: flutter
   path_provider: 2.1.5
   html: ^0.15.6
+  # 画中画：Android 原生 PiP，OnLeavePiP 支持退后台自动进小窗
+  floating: ^6.0.0
+  # 运行时权限：systemAlertWindow（「显示在其他应用上层」）
+  permission_handler: ^13.0.2
 
 dev_dependencies:
   flutter_test:
@@ -86,6 +90,7 @@ flutter:
     - assets/icon/splash_logo.png
     - assets/icon/splash_logo_android12.png
     - assets/icon/rail/
+    - assets/auth/
 
   # To add assets to your application, add an assets section, like this:
   # assets: