feat: 添加后端服务地址自定义配置功能

- 在设置面板添加后端服务地址配置项
   - 支持保存、加载和重置自定义配置
   - 配置持久化存储，重启后保留
   - 添加 SSE 请求日志用于验证配置

src/extension.ts

@@ -9,10 +9,19 @@ import { isTokenExpired } from "./utils/jwtUtils";
 import { NotificationService } from "./services/notificationService";
 import { InvitationService } from "./services/invitationService";
 import { ICCoderCodeActionProvider } from "./providers/codeActionProvider";
+import { setCustomConfig } from "./config/settings";
 
 export async function activate(context: vscode.ExtensionContext) {
   console.log("🎉 IC Coder 插件已激活！");
 
+  // 加载保存的配置
+  const savedSettings = context.globalState.get('generalSettings') as any;
+  if (savedSettings?.backendUrl) {
+    setCustomConfig({
+      backendUrl: savedSettings.backendUrl,
+    });
+  }
+
   // 创建装饰类型（代码旁边的提示）
   const decorationType = vscode.window.createTextEditorDecorationType({
     after: {
@@ -83,7 +92,7 @@ export async function activate(context: vscode.ExtensionContext) {
   });
 
   // 【已禁用】Authentication Provider 注册 - 无需登录
-  // const authProvider = new ICCoderAuthenticationProvider(context);
+  const authProvider = new ICCoderAuthenticationProvider(context);
   // context.subscriptions.push(
   //   vscode.authentication.registerAuthenticationProvider(
   //     "iccoder",