CF-Incidents AI Gateway - Standardize provider credential error responses in AI Gateway

[ENF News Bot]

AI Gateway's REST API now returns consistent responses when an AI provider rejects credentials. The change applies to POST /ai/run ↗︎.

Scenario	Previous AI Gateway response	New AI Gateway response
ElevenLabs	Provider-specific UserCredentialsError with HTTP 403	HTTP 401 with error code 2009
Google Vertex	HTTP 500 for rejected credentials, with upstream retries	HTTP 401 with error code 2009; the request fails without retrying the provider
All other providers	HTTP 402 or another provider-specific status for rejected credentials	HTTP 401 with error code 2009
When using Unified Billing, the provider rejects the credentials	Provider-specific authentication error	HTTP 503

Update applications that handle AI Gateway REST API errors to treat HTTP 401 as an invalid or rejected provider credential.

For details about providing provider credentials, refer to Bring your own provider keys.

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