Rate Limiter (防止 Gemini 用量暴衝): - ai_rate_limiter.py: RPM/Daily/Token 三層閥值 - openclaw.py: 整合 rate limit 檢查,超限自動降級 - health.py: /health/ai-usage 監控端點 RAG Tool 基礎 (#84 進行中): - embedding_service.py: Ollama embedding 封裝 - rag_service.py: Redis vector search 服務 閥值設定: - Gemini: 10 RPM, 500/day, 100K tokens/day - Claude: 5 RPM, 200/day, 50K tokens/day Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>