fix: 修复 showPlan 工具交互逻辑和 JWT Token 问题

- 修复 pendingQuestions 缺失时无法提交回答的问题
- 添加 fallbackTaskId 参数支持直接发送到后端
- apiClient 自动获取 JWT Token
- 取消按钮改为中止对话而非发送消息

src/services/apiClient.ts

@@ -2,6 +2,7 @@
  * API 客户端
  * 封装与后端的 HTTP 通信
  */
+import * as vscode from 'vscode';
 import * as https from 'https';
 import * as http from 'http';
 import { URL } from 'url';
@@ -18,6 +19,18 @@ interface RequestOptions {
   timeout?: number;
 }
 
+/**
+ * 获取当前登录的 Token
+ */
+async function getAuthToken(): Promise<string | undefined> {
+  try {
+    const session = await vscode.authentication.getSession('iccoder', [], { silent: true });
+    return session?.accessToken;
+  } catch {
+    return undefined;
+  }
+}
+
 /**
  * 发送 HTTP 请求
  */
@@ -25,6 +38,9 @@ async function request<T>(path: string, options: RequestOptions): Promise<T> {
   const url = new URL(getApiUrl(path));
   const { timeout } = getConfig();
 
+  // 自动获取 Token
+  const token = await getAuthToken();
+
   const isHttps = url.protocol === 'https:';
   const httpModule = isHttps ? https : http;
 
@@ -35,6 +51,7 @@ async function request<T>(path: string, options: RequestOptions): Promise<T> {
     method: options.method,
     headers: {
       'Content-Type': 'application/json',
+      ...(token ? { 'Authorization': `Bearer ${token}` } : {}),
       ...options.headers
     },
     timeout: options.timeout || timeout