feat(controlled): 实现设备激活与安全认证流程

- 添加API客户端、加密存储和provision/token激活逻辑
- WebSocket改用Bearer令牌认证，移除REGISTER请求
- 设备ID改为服务端下发，支持令牌刷新和强制下线处理
- 新增deviceSecret加密存储和accessToken自动刷新
- 更新设备ID获取方式为出厂SN，添加安全存储依赖

webrtc_controller_flutter/windows/flutter/generated_plugin_registrant.cc

@@ -6,9 +6,12 @@
 
 #include "generated_plugin_registrant.h"
 
+#include <flutter_secure_storage_windows/flutter_secure_storage_windows_plugin.h>
 #include <flutter_webrtc/flutter_web_r_t_c_plugin.h>
 
 void RegisterPlugins(flutter::PluginRegistry* registry) {
+  FlutterSecureStorageWindowsPluginRegisterWithRegistrar(
+      registry->GetRegistrarForPlugin("FlutterSecureStorageWindowsPlugin"));
   FlutterWebRTCPluginRegisterWithRegistrar(
       registry->GetRegistrarForPlugin("FlutterWebRTCPlugin"));
 }