- POST /api/ai/models lists the configured endpoint's models (OpenAI-compatible
/models) so the settings modal can populate a 'Load models' dropdown instead of
requiring users to type the model name. Combobox (datalist) so they can still
type a custom one. Admin only; same SSRF guard; uses the posted or saved key.
- Bump generate-design timeout 120s -> 180s for slow local endpoints.