feat: switch default AI provider to OpenAI (Issue A) #4
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Add minimal OpenAI client to lib/ai/openai.ts which reads environment variables and provides a streamChat function for streaming chat completions.
Implement POST /api/ai/chat with edge runtime for streaming OpenAI chat completions. Validates messages and provider, calls streamChat and returns SSE as raw text.
Adds a new Edge runtime GET endpoint at `/api/health` which performs a health check for the OpenAI provider. It reads `AI_PROVIDER`, `OPENAI_API_KEY`, `OPENAI_MODEL`, and `OPENAI_BASE_URL` from the environment, pings the OpenAI `/models` endpoint to determine service status, and returns a JSON payload: `{ status, services: { openai: { ok, model, error? }}}`. Missing keys or API failures are reported gracefully without crashing the app.
Adds an "AI Provider configuration" section to the README. This section documents the default OpenAI provider (`AI_PROVIDER=openai`) and lists the required environment variables: `OPENAI_API_KEY`, `OPENAI_MODEL` (default `gpt-4o-mini`), and `OPENAI_BASE_URL` (defaults to `https://api.openai.com/v1`). It also groups alternative provider keys (Anthropic, Gemini, Groq) under an optional section.
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This PR implements Issue #1 (LLM: Switch default to OpenAI + healthcheck + streaming endpoint).
Key changes
lib/ai/openai.ts, a helper to call the OpenAI Chat Completions API with streaming, readingAI_PROVIDER,OPENAI_API_KEY,OPENAI_MODEL, andOPENAI_BASE_URLfrom environment.app/api/ai/chat/route.tswhich validates input, ensuresAI_PROVIDERis set toopenai, and streams back raw assistant output via SSE parsing.app/api/health/route.tswhich checks for a valid OpenAI API key, queries the OpenAI/modelsendpoint, and returns{ status, services: { openai: { ok, model, error? }}}without crashing when keys are missing.These changes allow the app to default to OpenAI, stream chat responses to clients, and expose a healthcheck for monitoring. If
OPENAI_API_KEYis missing or invalid, the health endpoint will returnok: falsewith an error message instead of throwing.Closes #1