Bring the Keenable search provider in line with the established
multi-file provider pattern so it surfaces everywhere the others do:
- settings_api.py: register in the web-search provider options so it
appears in the WebUI settings dropdown (credential: api_key, optional).
- WebUI provider-brand: add keenable brand entry + brand test.
- docs/configuration.md: provider table row + config example.
- Harden _search_keenable: honor config.timeout and return explicit
messages on HTTP status errors (429 / other), matching peer providers.
- Add env-key and HTTP-error tests; add the websocket settings whitelist
assertion.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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