feat: implement grid-db buffer layer (Phase 1-4)
- Create buffer/ directory structure (inbox, staging, processed, scripts, config)
- Add buffer-config.json, schedule.json, buffer-message.schema.json
- Add auto-router.js, collector.js, flusher.js, quota-calculator.js
- Add buffer-collect.yml and buffer-flush.yml workflows
- Modify skyeye-checkin-receiver.yml to write to buffer/inbox/
- Add iron-rule check: block direct writes to grid-db/
- Add buffer/README.md and update grid-db/README.md
Co-authored-by: qinfendebingshuo <207279273+qinfendebingshuo@users.noreply.github.com>
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