feat: 5.4.0版本大更新，新增多端桌面小组件与多项功能优化

- 重构「灵感」模块为「发现」模块，统一页面命名与文案
- 新增flutter_tts语音朗读依赖与鸿蒙Nearby配对方式
- 添加Android/iOS/鸿蒙全平台桌面小组件支持（7种类型）
- 完善文件传输模块，新增画布邀请消息与删除会话功能
- 优化协作画布光标广播节流逻辑，修复已知bug
- 更新应用英文名与隐私政策入口，新增翻译API抽象层
- 移除用户中心多余的加号按钮，完善空状态组件类型

macos/Flutter/GeneratedPluginRegistrant.swift

@@ -17,6 +17,7 @@ import flutter_image_compress_macos
 import flutter_inappwebview_macos
 import flutter_local_notifications
 import flutter_secure_storage_macos
+import flutter_tts
 import flutter_webrtc
 import gal
 import local_auth_darwin
@@ -49,6 +50,7 @@ func RegisterGeneratedPlugins(registry: FlutterPluginRegistry) {
   InAppWebViewFlutterPlugin.register(with: registry.registrar(forPlugin: "InAppWebViewFlutterPlugin"))
   FlutterLocalNotificationsPlugin.register(with: registry.registrar(forPlugin: "FlutterLocalNotificationsPlugin"))
   FlutterSecureStoragePlugin.register(with: registry.registrar(forPlugin: "FlutterSecureStoragePlugin"))
+  FlutterTtsPlugin.register(with: registry.registrar(forPlugin: "FlutterTtsPlugin"))
   FlutterWebRTCPlugin.register(with: registry.registrar(forPlugin: "FlutterWebRTCPlugin"))
   GalPlugin.register(with: registry.registrar(forPlugin: "GalPlugin"))
   LocalAuthPlugin.register(with: registry.registrar(forPlugin: "LocalAuthPlugin"))