refactor: 移除多余依赖，统一 MUI 为唯一 UI 库

- 移除 radix-ui、clsx、tailwind-merge、class-variance-authority、react-router-dom

- 前后端全面适配 MUI 组件，清理残留 Tailwind 工具类引用

- 优化 Agent Loop 引擎、IPC 处理器、Provider Adapter 等后端模块

- 新增 Agent 网络工具通用设计文档 v2

electron/harness/adapters/base-adapter.ts

@@ -30,7 +30,7 @@ export abstract class BaseAdapter implements IMetonaProviderAdapter {
 
   async healthCheck(): Promise<boolean> {
     try {
-      await this.listModels?.();
+      await this.listModels();
       return true;
     } catch {
       return false;
@@ -58,6 +58,16 @@ export abstract class BaseAdapter implements IMetonaProviderAdapter {
         };
       }
 
+      if (msg.includes('ECONNREFUSED') || msg.includes('ENOTFOUND') || msg.includes('ECONNRESET')) {
+        return {
+          code: MetonaErrorCode.NETWORK_ERROR,
+          message: error.message,
+          provider: this.provider,
+          retryable: true,
+          retryAfterMs: 3000,
+        };
+      }
+
       if (msg.includes('401') || msg.includes('unauthorized')) {
         return {
           code: MetonaErrorCode.AUTH_INVALID,