feat(core): 实现 ask_user_question 工具的用户输入等待机制

- 创建 UserInputWaiter 管理用户输入等待状态
- 修改 agent-tool-executor 在 requiresUserInput 时等待用户回答
- 添加 onWaitingForInput 回调通知前端显示问题
- Server 端处理 waiting_for_input 广播和 user_input_response 消息
- 前端处理问题显示和用户回答提交
- 修复问题选项在流式输出时被禁用的问题

packages/server/src/ws.ts

@@ -6,7 +6,7 @@
 
 import type { WSContext } from 'hono/ws';
 import { getSessionManager } from './session/manager.js';
-import { processMessage, cancelProcessing, getOrCreateAgent } from './agent/index.js';
+import { processMessage, cancelProcessing, getOrCreateAgent, submitUserInput } from './agent/index.js';
 import { handlePermissionResponse, setSessionAutoApprove } from './permission/handler.js';
 import type { ClientMessage, ServerMessage } from './types.js';
 
@@ -201,6 +201,33 @@ export async function handleWebSocketMessage(
         break;
       }
 
+      case 'user_input_response': {
+        // 处理用户输入响应（用于 ask_user_question 等工具）
+        const toolCallId = message.payload?.toolCallId;
+        const answer = message.payload?.answer;
+
+        if (toolCallId && answer !== undefined) {
+          const handled = submitUserInput(toolCallId, answer);
+          if (!handled) {
+            console.warn(`[WS] User input response for unknown tool call: ${toolCallId}`);
+            broadcastToSession(sessionId, {
+              type: 'error',
+              sessionId,
+              payload: { message: `No pending input request for tool call: ${toolCallId}` },
+            });
+          } else {
+            console.log(`[WS] User input submitted for tool call: ${toolCallId}`);
+          }
+        } else {
+          broadcastToSession(sessionId, {
+            type: 'error',
+            sessionId,
+            payload: { message: 'Missing toolCallId or answer in user_input_response' },
+          });
+        }
+        break;
+      }
+
       default:
         ws.send(
           JSON.stringify({