feat(iit-manager): Add WeChat Official Account integration for patient notifications

Features:
- PatientWechatCallbackController for URL verification and message handling
- PatientWechatService for template and customer messages
- Support for secure mode (message encryption/decryption)
- Simplified route /wechat/patient/callback for WeChat config
- Event handlers for subscribe/unsubscribe/text messages
- Template message for visit reminders

Technical details:
- Reuse @wecom/crypto for encryption (compatible with Official Account)
- Relaxed Fastify schema validation to prevent early request blocking
- Access token caching (7000s with 5min pre-refresh)
- Comprehensive logging for debugging

Testing: Local URL verification passed, ready for SAE deployment

Status: Code complete, waiting for WeChat platform configuration

docs/03-业务模块/IIT Manager Agent/06-开发记录/2026-01-04-Dify知识库集成开发记录.md

@@ -631,3 +631,4 @@ REDCap API: exportRecords success { recordCount: 1 }
 **✅ 测试状态**: 全部通过  
 **✅ 部署状态**: 已部署到开发环境
 
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docs/03-业务模块/IIT Manager Agent/06-开发记录/Day2-REDCap实时集成开发完成记录.md

@@ -637,3 +637,4 @@ backend/src/modules/iit-manager/
 
 
 
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docs/03-业务模块/IIT Manager Agent/06-开发记录/Day3-企业微信集成与端到端测试完成记录.md

@@ -787,3 +787,4 @@ CREATE TABLE iit_schema.wechat_tokens (
 
 
 
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docs/03-业务模块/IIT Manager Agent/06-开发记录/Day3-企业微信集成开发完成记录.md

@@ -544,3 +544,4 @@ Day 3 的开发工作虽然遇到了多个技术问题，但最终成功完成
 
 
 
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docs/03-业务模块/IIT Manager Agent/06-开发记录/Phase1.5-AI对话集成REDCap完成记录.md

@@ -311,3 +311,4 @@ AI: "出生日期：2017-01-04
 **下一步**: Phase 2 - Function Calling + Dify知识库
 
 
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docs/03-业务模块/IIT Manager Agent/06-开发记录/V1.1更新完成报告.md

@@ -255,3 +255,4 @@ Day 4: REDCap EM（Webhook推送）← 作为增强，而非核心
 
 
 
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