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>

src/routes/(app)/+layout.svelte

@@ -77,8 +77,11 @@
                     <button type="button" class="btn btn-ghost normal-case text-lg">
                         {$user.username}
                     </button>
-                    <ul class="dropdown-content menu p-2 shadow bg-base-100 rounded-box w-52 text-black">
+                    <ul class="dropdown-content menu p-2 shadow bg-base-100 rounded-box w-52 text-black dark:text-gray-200">
                         <li><a href="/vendor">Dashboard</a></li>
+                        {#if $user.username === 'Anekdotin'}
+                            <li><a href="/admin">Admin Dashboard</a></li>
+                        {/if}
                         <li><button type="button" on:click={logout}>Logout</button></li>
                     </ul>
                 </div>
@@ -94,7 +97,7 @@
         <div>
             <p>Copyright © {new Date().getFullYear()} - All right reserved</p>
             {#if !$user}
-                <a href="/login" class="link link-primary">Dealer Login</a>
+                <a href="/login" class="link link-primary">Vendor Login</a>
             {/if}
         </div>
     </footer>