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/07-运维文档/03-SAE环境变量配置指南.md

@@ -392,5 +392,6 @@ curl http://你的SAE地址:3001/health
 
 
 
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docs/07-运维文档/05-Redis缓存与队列的区别说明.md

@@ -724,5 +724,6 @@ const job = await queue.getJob(jobId);
 
 
 
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docs/07-运维文档/06-长时间任务可靠性分析.md

@@ -491,5 +491,6 @@ processLiteraturesInBackground(task.id, projectId, testLiteratures);
 
 
 
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docs/07-运维文档/07-Redis使用需求分析(按模块).md

@@ -968,5 +968,6 @@ ROI = (¥22,556 - ¥144) / ¥144 × 100% = 15,564%
 
 
 
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