Remote provider authentication errors (401/403) were being converted to 500 Internal Server Error, hiding the real cause from users.
Now checks if exceptions have a status_code attribute and preserves it. This fixes authentication error handling for all remote inference providers using OpenAI SDK (groq, openai, together, fireworks, etc.) and similar provider SDKs.
Before:
- HTTP 500: "Internal server error: An unexpected error occurred."
After:
- HTTP 401: "Error code: 401 - Invalid API Key"
Fixes#2990
Test Plan:
1. Build stack: llama stack build --image-type venv --providers inference=remote::groq
2. Start stack: llama stack run
3. Send request with invalid API key via x-llamastack-provider-data header
4. Verify response is 401 with provider error message (not 500)
5. Repeat for openai, together, fireworks providers
359d3eeff2