Integrate the official openai-go SDK (v3) as a thin, reusable LLM layer
(pkg/llm) backing lightweight utility calls that do not need the agent
runtime (chat titles, quick-create drafts, ...).
Expose two user-authenticated, OpenAI-compatible chat-completions
endpoints:
- POST /api/llm/v1/chat/completions (JSON response)
- POST /api/llm/v1/chat/completions/stream (SSE stream)
Requests decode directly into the SDK's ChatCompletionNewParams and
responses are relayed via RawJSON() for byte-exact OpenAI-format
compatibility. Base URL and API key are configurable (MULTICA_LLM_*),
and the model is taken from the request with a configurable default
fallback (MULTICA_LLM_DEFAULT_MODEL, else gpt-4o-mini). When unconfigured
the endpoints return 503.
Co-authored-by: Eve <eve@multica-ai.local>
Co-authored-by: multica-agent <github@multica.ai>
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