Builtin API Server connector for the OpenWeather API (current weather +
5-day forecast for a point, API-key auth, stdlib-only), surfaced to end
users through the same three-layer settings cascade as OpenSky/WebDAV.
- New builtin plugin (internal/plugins/builtin/openweather) with
health probe, weather.current/forecast.5day capabilities, and tests.
- resolveOpenWeather cascade (global -> org -> user) with per-field
independent resolution and API-key masking; GET/PUT/health endpoints.
- Web App BFF relays, api.js client, and a Settings card under
APIs - External (scope switch, enable toggles, test connection).
- Resolver unit tests + rebuilt embedded frontend.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
