feat: 支持 AskUserQuestion 多问题和多选功能

- 新增 QuestionItem 类型支持单个问题配置（question/options/multiSelect）
   - AskUserEvent 改为 questions 数组支持多问题
   - AnswerRequest 新增 answers 字段支持多问题答案提交
   - 前端渲染支持单选按钮（radio）和多选复选框（checkbox）
   - 答案格式：{\"0\": [\"选项1\"], \"1\": [\"选项A\", \"选项B\"]}
   - 保持向后兼容旧的单问题格式

src/services/dialogService.ts

@@ -43,8 +43,7 @@ export interface MessageSegment {
   toolResult?: string;
   toolDescription?: string;
   askId?: string;
-  question?: string;
-  options?: string[];
+  questions?: import("../types/api").QuestionItem[];
   // 智能体相关字段
   agentId?: string;
   agentName?: string;
@@ -97,7 +96,7 @@ export interface DialogCallbacks {
     summary: string
   ) => void;
   /** 显示问题（ask_user） */
-  onQuestion?: (askId: string, question: string, options: string[]) => void;
+  onQuestion?: (askId: string, questions: import("../types/api").QuestionItem[]) => void;
   /** 实时更新段落（流式过程中） */
   onSegmentUpdate?: (segments: MessageSegment[]) => void;
   /** 对话完成，返回所有段落 */
@@ -647,8 +646,11 @@ export class DialogSession {
         this.segments.push({
           type: "question",
           askId: askId,
-          question: question,
-          options: ["确认执行", "取消"],
+          questions: [{
+            question: question,
+            options: ["确认执行", "取消"],
+            multiSelect: false
+          }],
         });
 
         // 实时发送段落更新
@@ -666,8 +668,11 @@ export class DialogSession {
           await userInteractionManager.handleAskUser(
             {
               askId: askId,
-              question: question,
-              options: ["确认执行", "取消"],
+              questions: [{
+                question: question,
+                options: ["确认执行", "取消"],
+                multiSelect: false
+              }]
             } as AskUserEvent,
             this.taskId
           );
@@ -714,8 +719,11 @@ export class DialogSession {
         // 注册问题到前端（类似 askUser），以便用户回答时能找到
         const planEvent = {
           askId: askId,
-          question: `请确认执行计划：${data.title}`,
-          options: ["确认执行", "修改计划", "取消"],
+          questions: [{
+            question: `请确认执行计划：${data.title}`,
+            options: ["确认执行", "修改计划", "取消"],
+            multiSelect: false
+          }]
         };
         try {
           await userInteractionManager.handleAskUser(
@@ -856,13 +864,12 @@ export class DialogSession {
         this.segments.push({
           type: "question",
           askId: data.askId,
-          question: data.question,
-          options: data.options,
+          questions: data.questions,
         });
         // 实时发送段落更新（包含问题）
         callbacks.onSegmentUpdate?.(this.segments);
         // 同时调用 onQuestion 用于更新状态栏等
-        callbacks.onQuestion?.(data.askId, data.question, data.options);
+        callbacks.onQuestion?.(data.askId, data.questions);
         try {
           await userInteractionManager.handleAskUser(data, this.taskId);
         } catch (error) {
@@ -1110,7 +1117,8 @@ export class DialogSession {
   async submitAnswer(
     askId: string,
     selected?: string[],
-    customInput?: string
+    customInput?: string,
+    answers?: { [questionIndex: string]: string[] }
   ): Promise<void> {
     // 直接调用 receiveAnswer，传递 taskId 作为 fallbackTaskId
     // 如果 pendingQuestions 中有问题，走正常流程
@@ -1119,6 +1127,7 @@ export class DialogSession {
       askId,
       selected,
       customInput,
+      answers,
       this.taskId
     );
   }