GitHub Actions dfdb7087dc perf: session reuse for multi-turn latency ...

- Add SessionCache (LRU + TTL, per-API-key scoped) mapping
  conversation-prefix hash -> upstream Lingma sessionId.
- Hash only user/system/developer turns so client-side
  assistant reformatting doesn't invalidate the key.
- On cache hit: reuse sessionId, send only the latest user
  message with isReply=true, and stick the request to the
  instance that originally served it.
- LingmaGatewayClient.chat_complete/chat_stream accept
  session_id/is_reply and report the real finish.sessionId
  via out_meta so we persist what Lingma actually allocated.
- Invalidate cache on non-stream failure; skip writes on
  cancelled/partial streams.
- Expose cache stats in /internal/stats and /metrics.
- Configurable via SESSION_REUSE_ENABLED / SESSION_CACHE_MAX_ENTRIES
  / SESSION_CACHE_TTL_SEC (documented in README + .env.example).

Made-with: Cursor

2026-04-18 08:10:39 +08:00

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