refactor: 将 Ask 模式的工具确认从弹窗改为内嵌聊天卡片

## 主要修改

   ### dialogService.ts
   - 移除 `vscode.window.showWarningMessage` 弹窗
   - 将工具确认改为添加 question 类型的 segment
   - 使用 `userInteractionManager.handleAskUser` 等待用户回答
   - 生成唯一的 askId: `tool_confirm_{confirmId}`

   ### userInteraction.ts
   - 导入 `submitToolConfirm` 方法
   - 在 `submitUserAnswer` 中识别工具确认类型的 askId
   - 根据用户选择（"确认执行" / "取消"）调用对应的 API

   ## 用户体验改进
   - 工具确认问题自然融入对话流程
   - 用户可以看到历史确认记录
   - 非阻塞式交互，体验更流畅

src/services/userInteraction.ts

@@ -3,7 +3,7 @@
  * 处理 ask_user 事件，通过 WebView 显示问题并收集用户回答
  */
 import * as vscode from 'vscode';
-import { submitAnswer } from './apiClient';
+import { submitAnswer, submitToolConfirm } from './apiClient';
 import type { AskUserEvent, AnswerRequest } from '../types/api';
 
 /**
@@ -107,21 +107,46 @@ export class UserInteractionManager {
     taskId: string,
     answer: string
   ): Promise<void> {
-    const request: AnswerRequest = {
-      askId,
-      taskId,
-      customInput: answer
-    };
+    // 检查是否是工具确认类型的问题
+    if (askId.startsWith('tool_confirm_')) {
+      // 提取 confirmId
+      const confirmId = parseInt(askId.replace('tool_confirm_', ''));
+      const approved = answer === '确认执行';
 
-    try {
-      const response = await submitAnswer(request);
-      if (!response.success) {
-        throw new Error(response.error || '提交回答失败');
+      console.log(`[UserInteraction] 提交工具确认: confirmId=${confirmId}, approved=${approved}`);
+
+      try {
+        const response = await submitToolConfirm({
+          confirmId,
+          taskId,
+          approved
+        });
+        if (!response.success) {
+          throw new Error(response.error || '提交工具确认失败');
+        }
+        console.log(`[UserInteraction] 工具确认已提交: confirmId=${confirmId}`);
+      } catch (error) {
+        console.error(`[UserInteraction] 提交工具确认失败: confirmId=${confirmId}`, error);
+        throw error;
+      }
+    } else {
+      // 普通问题回答
+      const request: AnswerRequest = {
+        askId,
+        taskId,
+        customInput: answer
+      };
+
+      try {
+        const response = await submitAnswer(request);
+        if (!response.success) {
+          throw new Error(response.error || '提交回答失败');
+        }
+        console.log(`[UserInteraction] 回答已提交: askId=${askId}`);
+      } catch (error) {
+        console.error(`[UserInteraction] 提交回答失败: askId=${askId}`, error);
+        throw error;
       }
-      console.log(`[UserInteraction] 回答已提交: askId=${askId}`);
-    } catch (error) {
-      console.error(`[UserInteraction] 提交回答失败: askId=${askId}`, error);
-      throw error;
     }
   }