feat(channel-service): add Python FastAPI pywechat channel service
- Add FastAPI project under channel-service/ - Implement mock pywechat client adapter (login, send, heartbeat) - Add /v1/wechat-personal/login/*, /v1/wechat-personal/send/* APIs - Add /v1/heartbeat and /v1/monitor/status for client health - Add /monitor HTML page with Web Components - Add pytest suite and Dockerfile - Update .gitignore for Python/Node artifacts
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