Hermes Agent 5936a2f328 feat: implement sync engine, API handlers, DAPI auth, HTTP client ...

- Sync engine: BaseSync abstract class + 4 sync modules (users/pricing/uapi/llmage)
  - Checkpoint management via sync_state table
  - Batch processing with retry and exponential backoff
  - Incremental fetch from Sage DB via sqlor
  - UPSERT to local cache tables
- API handlers: balance/accounting/users/pricing/health
  - Balance: cache lookup + Sage fallback
  - Accounting: create with idempotency, query with filters/pagination
  - Users: keyword search, org filter
  - Pricing: filter by ppid/llmid/type/status
  - Health: basic + readiness checks (DB connectivity)
- DAPI auth: middleware + authenticate_request function
  - HMAC-SHA256 signature verification
  - Timestamp window validation
  - Sage downapikey table lookup
- HTTP client: SageHttpClient with aiohttp
  - Auto DAPI signature injection
  - Connection pooling, retry, timeout
- Router: 12 routes registered
- Module init: load_sageapi() wires everything to ServerEnv

2026-05-20 18:22:23 +08:00

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