Merge the "Models" menu item into the "Settings" page with top tabs
(Basic / Models), reducing one nav entry. Basic settings now only handles
provider + model selection; API key/base are consolidated into the Models
tab. Unconfigured providers are marked in the dropdown and guide the user
to configure them.
The Models tab covers all 7 capabilities (chat/vision/image/asr/tts/
embedding/search) with vendor credentials and routing. The vendor section
follows the web client's unified design: built-in and custom providers
share one grid, "set as default" is removed, and credentials are configured
via modals.
- Add settings/ directory: SettingsPage (tab shell), BasicSettings, ModelsTab,
CapabilityCard, primitives, modelsHelpers; remove the old ConfigPage
- Rewrite ModelEntry/ModelProvider/CapabilityState/SearchCapabilityState in
types.ts to match the real /api/models shape (mixed string|{value,hint})
- Fix empty chat model dropdown: chat has no provider_models, so fall back
to the top-level providers[].models
- Fix chat scroll sliding from top on session switch: snap instantly to
bottom on switch, smooth-scroll only for streaming updates
- Rename the Knowledge menu label and align model/config copy with the web
client (vendor credentials, main model, etc.)
- Clean up orphaned i18n keys
