Adds `label()` methods to TrendDirection and PredictionSource enums for cleaner display. Fixes mixed tab/space indentation in StatsOverviewWidget. Links all stats cards to their respective Filament resources (searches, stations, oil-predictions, api-logs). Documents BrentPriceChartWidget's manual registration.
Adds complete API reference (api-reference.md) covering all endpoints: /api/stations (nearby search with postcode/lat+lng), /api/stats/searches (aggregated search stats), /api/prediction (7-day price forecast with multi-signal breakdown), and auth routes (register/login/logout/me). Includes request/response examples, error shapes, fuel type aliases, and signal structure details. Also removes unused AccountWidget from admin panel, disables BrentPriceChartWidget discovery, and adds searches stat to StatsOverviewWidget.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
