[minump]

filter non-chat models in chat page
have public api dialog box hide chat button for non-chat models.

Tested by running the backend and frontend in local. Added non-chat models to ModelDeployment table and tested if the chat button shows up and if the api dialogue box is populated correctly.

[Copilot]

🟢 Approval recommended

No active review issues are reported for the changes restricting chat options and API examples to supported model types.

No open issues 🎉

What changed in this PR

This PR filters non-chat models from the chat picker and hides their Chat action on Active Models cards. It also prevents the public API dialog from showing chat-completions examples for unsupported model types.

Changes:

• Centralizes chat-capability checks for LLM, VLM, and models with no declared type.
• Filters chat deployment options and displays an unavailable-examples message for unsupported API types.
• Adds unit coverage for model filtering, Chat button visibility, and endpoint selection.

File	Description
frontend/​tests/​unit/​public-api-snippets.test.ts	Tests unsupported endpoint selection for reward models.
frontend/​tests/​unit/​chat-models-route.test.ts	Tests exclusion of non-chat deployments.
frontend/​tests/​unit/​active-model-card.test.tsx	Tests Chat button visibility by model type.
frontend/​lib/​public-api-snippets.ts	Returns no endpoint for unsupported model types.
frontend/​lib/​models/​types.ts	Adds the shared chat-capability helper.
frontend/​components/​public-api-dialog.tsx	Handles unsupported endpoints without showing request examples.
frontend/​components/​model-card/​active-model-card.tsx	Shows Chat only for chat-capable models.
frontend/​app/​api/​chat/​models/​route.ts	Filters deployments using catalog model types.
CHANGELOG.md	Documents filtering, dialog behavior, and test coverage.

_{Review effort: Balanced}