GitHub Actions 0b08dc6573 feat: Anthropic Messages API compat (/v1/messages) ...

Add a wire-compatible Anthropic endpoint alongside the existing OpenAI one
so Claude Code / anthropic-sdk / Cursor Agent can hit Lingma directly.

- app/anthropic_schema.py (new): request model + content-block flattener
  + internal-messages adapter + affinity key helper. Handles text / image /
  tool_use / tool_result blocks; unknown types degrade gracefully.
- app/auth.py: add require_anthropic_key (x-api-key, Bearer fallback)
  and AnthropicAuthError so auth failures render in Anthropic's error
  envelope instead of FastAPI's {detail:...} wrapper.
- app/main.py: POST /v1/messages. Shares LingmaPool / SessionCache /
  InFlightGuard / StatsCollector with the OpenAI path — same api_key +
  same conversation prefix hits the same upstream sessionId across both
  protocols (KV cache carries over). Streaming emits the named Anthropic
  event sequence (message_start / content_block_start / content_block_delta
  / content_block_stop / message_delta / message_stop). No claude-*
  model mapping table: resolve_model's default fallback handles it.
- README.md / DESIGN.md: document the new endpoint, add decision 5.12,
  iteration history M5, and a 4.3b streaming flow diagram.
- Bump FastAPI app version to 0.4.0.

Made-with: Cursor

2026-04-18 15:40:43 +08:00

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