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/ASL-AI智能文献/05-开发记录/2025-01-23_全文复筛前端开发完成.md

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docs/03-业务模块/ASL-AI智能文献/05-开发记录/2025-01-23_全文复筛前端逻辑调整.md

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docs/03-业务模块/ASL-AI智能文献/05-开发记录/2025-11-23_Day5_全文复筛API开发.md

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