Add the Azure OpenAI route + model registry to the qbraid-account gateway

[Kenny-Heitritter]

Question

In qbraid-account, the /api/ai/v1 gateway routes only to Bedrock + Vertex — there is no Azure path. Add it:

• New azure-openai provider case in src/app/api/ai/v1/chat/completions/route.ts (reads AZURE_OPENAI_ENDPOINT / AZURE_OPENAI_API_KEY / api-version; routes by Azure deployment name).
• Register the 3 models in src/lib/config/models.ts with codeqModelId: qbraid/<id> and add the request-alias entries.

Staging behaviour only (prod routing is out of scope for this effort). Uses the real model ids from the discovery ticket. Creds provisioning is a separate ticket — this one reads the agreed env vars.