root 8f550a2100 docs: add LLM Gateway implementation plan
Plan includes 6 batches with 34 tasks:
- Batch 1: Project foundation (config, db, logging)
- Batch 2: Data models and Admin API (CRUD)
- Batch 3: Core services (transformer, router, rate limiter, budget)
- Batch 4: Provider adapters (OpenAI, Anthropic, Azure, Gemini, Bedrock)
- Batch 5: API endpoints (chat, messages, responses)
- Batch 6: Management and deployment

Estimated time: 19-25 hours

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
2026-05-01 14:55:18 +08:00
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