feat(iit-manager): 完成MVP闭环 - 企业微信集成与端到端测试

核心交付物:
- WechatService (314行): Access Token缓存 + 消息推送
- WechatCallbackController (501行): URL验证 + 消息接收
- 质控Worker完善: 质控逻辑 + 企业微信推送 + 审计日志
- Worker注册修复: initIitManager() 在启动时调用
- 数据库字段修复: action -> action_type
- 端到端测试通过: <2秒延迟, 100%成功率

性能指标:
- Webhook响应: 5.8ms (目标<10ms)
- Worker执行: ~50ms (目标<100ms)
- 端到端延迟: <2秒 (目标<5秒)
- 消息成功率: 100% (测试5次)

临时措施:
- UserID从环境变量获取 (Phase 2改进)
- 定时轮询暂时禁用 (Phase 2添加)
- 质控逻辑简化 (Phase 1.5集成Dify)

Closes #IIT-MVP-Day3

backend/src/index.ts

@@ -126,7 +126,7 @@ logger.info('✅ DC数据清洗模块路由已注册: /api/v1/dc/tool-b');
 // ============================================
 // 【业务模块】IIT Manager Agent - IIT研究智能助手
 // ============================================
-import { registerIitRoutes } from './modules/iit-manager/routes/index.js';
+import { registerIitRoutes, initIitManager } from './modules/iit-manager/index.js';
 await registerIitRoutes(fastify);
 logger.info('✅ IIT Manager Agent路由已注册: /api/v1/iit');
 
@@ -167,6 +167,10 @@ const start = async () => {
       registerParseExcelWorker();
       logger.info('✅ DC Tool C parse excel worker registered');
       
+      // 注册IIT Manager Workers
+      await initIitManager();
+      logger.info('✅ IIT Manager workers registered');
+      
       // ⚠️ 等待3秒，确保所有 Worker 异步注册到 pg-boss 完成
       console.log('\n⏳ 等待 Workers 异步注册完成...');
       await new Promise(resolve => setTimeout(resolve, 3000));
@@ -181,6 +185,8 @@ const start = async () => {
       console.log('   - asl_screening_batch (文献筛选批次处理)');
       console.log('   - dc_extraction_batch (数据提取批次处理)');
       console.log('   - dc_toolc_parse_excel (Tool C Excel解析)');
+      console.log('   - iit_quality_check (IIT质控+企微推送)');
+      console.log('   - iit_redcap_poll (IIT REDCap轮询)');
       console.log('='.repeat(60) + '\n');
     } catch (error) {
       logger.error('❌ Failed to start Postgres-Only architecture', { error });