feat(iit): Complete Day 3 - WeChat Work integration and URL verification

Summary:
- Implement WechatService (314 lines, push notifications)
- Implement WechatCallbackController (501 lines, async reply mode)
- Complete iit_quality_check Worker with WeChat notifications
- Configure WeChat routes (GET + POST /wechat/callback)
- Configure natapp tunnel for local development
- WeChat URL verification test passed

Technical Highlights:
- Async reply mode to avoid 5-second timeout
- Message encryption/decryption using @wecom/crypto
- Signature verification using getSignature
- natapp tunnel: https://iit.nat100.top
- Environment variables configuration completed

Technical Challenges Solved:
- Fix environment variable naming (WECHAT_CORP_SECRET)
- Fix @wecom/crypto import (createRequire for CommonJS)
- Fix decrypt function parameters (2 params, not 4)
- Fix Token character recognition (lowercase l vs digit 1)
- Regenerate EncodingAESKey (43 chars, correct format)
- Configure natapp for internal network penetration

Test Results:
- WeChat developer tool verification: PASSED
- Return status: request success
- HTTP 200, decrypted 23 characters correctly
- Backend logs: URL verification successful

Documentation:
- Add Day3 WeChat integration development record
- Update MVP development task list (Day 2-3 completed)
- Update module status guide (v1.2 -> v1.3)
- Overall completion: 35% -> 50%

Progress:
- Module completion: 35% -> 50%
- Day 3 development: COMPLETED
- Ready for end-to-end testing (REDCap -> WeChat)

docs/05-部署文档/00-阿里云SAE最新真实状态记录.md

@@ -157,9 +157,9 @@ QUEUE_TYPE=pgboss
 CACHE_TYPE=postgres
 
 # 企业微信配置
-WECHAT_CORP_ID=ww01cb7b72ea2db83c
+WECHAT_CORP_ID=ww6ab493470ab4f377
 WECHAT_AGENT_ID=1000002
-WECHAT_AGENT_SECRET=F3XqlAqKdcOKHi9pLGv5a2dSUowWbevdcDRrBk2pXLM
+WECHAT_CORP_SECRET=AZIVxMtoLb0rEszXS81e4dBRl-I9kgTjygIS0cFfENU
 ```
 
 **前端Nginx（frontend-nginx-service）**：