feat: implement dual-channel architecture (Channel A cache + Channel B backend)
- Add scripts/cache/sync-notion-cache.js for comprehensive Notion sync
- Add .github/workflows/sync-notion-cache.yml (every 6h + manual trigger)
- Add .github/workflows/deploy-backend.yml for ECS auto-deploy
- Add missing dev profiles: DEV-009.json, DEV-011.json, index.json
- Add .github/notion-cache/databases/ directory
- Add backend/api-server/ with Express server (port 3001)
- Routes: health, dev, databases, chat, receipt
- Services: notion, github, cache
- Config: database ID mappings
- PM2 ecosystem config
- Update docs/index.html with dual-channel fallback:
- Channel B (realtime) → Channel A (cache) degradation
- loadDatabaseCache() for agent-registry, syslog-recent
- Enhanced system prompt with data source indicators
Co-authored-by: qinfendebingshuo <207279273+qinfendebingshuo@users.noreply.github.com>
Agent-Logs-Url: https://github.com/qinfendebingshuo/guanghulab/sessions/a260ce18-279a-4490-af90-a90a7b1f46cd
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