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>

calendar.html

@@ -85,14 +85,16 @@
 
   <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('calendar');
     renderBanner();
     renderFooter();
 
+    (async () => {
+      const MOCK_SEASONAL_RESTRICTIONS = await PilotEdge.getSeasonalRestrictions();
+
     // ---- Constants ----
     const MONTHS = ['Jan','Feb','Mar','Apr','May','Jun','Jul','Aug','Sep','Oct','Nov','Dec'];
 
@@ -286,6 +288,7 @@
 
     // ---- Initial render ----
     applyFilters();
+    })();
   </script>
 </body>
 </html>