Add OilPrice type and oilPrices.getByCounty() API client method. County
page now fetches both premium listings and scraped oil prices in parallel,
displaying them in separate sections with appropriate table/card views.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Introduced a new API client in src/lib/api/ to handle requests securely. Refactored vendor pages to use this client. Updated authentication logic in layout and login pages.
Regenerated all 16 Maine county boundaries from us_counties.json source data
with proper Mercator projection and latitude correction. Fixes viewBox to match
the standard 0 0 1000 600 used by the state page component.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
