Add Node.js/Express backend with PostgreSQL and wire frontend to API

- Server: Express.js with 13 API route files (auth, regulations, contacts,
  calendar, truck stops, bridges, weigh stations, alerts, load board,
  escort locator, orders, documents, contributions)
- Database: PostgreSQL with Prisma ORM, 15 models covering all modules
- Auth: JWT + bcrypt with role-based access control (driver/carrier/escort/admin)
- Geospatial: Haversine distance filtering on truck stops, bridges, escorts
- Seed script: Imports all existing mock data (51 states, contacts, equipment,
  truck stops, bridges, weigh stations, alerts, seasonal restrictions)
- Frontend: All 10 data-driven pages now fetch from /api instead of mock-data.js
- API client (api.js): Compatibility layer that transforms API responses to
  match existing frontend rendering code, minimizing page-level changes

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

weighstations.html

@@ -90,14 +90,16 @@
 
   <div id="main-footer"></div>
 
-  <script src="mock-data.js"></script>
-  <script src="mock-data-extended.js"></script>
+  <script src="api.js"></script>
   <script src="nav.js"></script>
   <script>
     renderNav('weighstations');
     renderBanner();
     renderFooter();
 
+    (async () => {
+    const MOCK_WEIGH_STATIONS = await PilotEdge.getWeighStations();
+
     // ── Local mutable copy of station data ──
     const stations = JSON.parse(JSON.stringify(MOCK_WEIGH_STATIONS));
 
@@ -261,6 +263,7 @@
 
     // Initial render
     applyFilters();
+    })();
   </script>
 </body>
 </html>