feat: add admin panel, stats API, and url support across frontend

- Add adminApi with full CRUD for users, companies, listings, oil-prices
- Add statsApi for fetching latest market price aggregates
- Add AdminTable component and /admin page for site management
- Add StatsPrice, UpdateUserRequest, UpdateOilPriceRequest types
- Add url field support in listing create/edit forms
- Update state SVG data for all 6 New England states
- Update county page to display richer listing info (phone, url, bio%)
- Misc layout and style updates across vendor and public routes

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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