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>

server/src/routes/alerts.js

@@ -0,0 +1,54 @@
+const express = require('express');
+const prisma = require('../config/db');
+
+const router = express.Router();
+
+// GET /api/alerts?state=...&type=...&severity=...
+router.get('/', async (req, res, next) => {
+  try {
+    const { state, type, severity } = req.query;
+    const where = {};
+
+    if (state) {
+      where.state = { abbr: state.toUpperCase() };
+    }
+    if (type) {
+      where.type = type;
+    }
+    if (severity) {
+      where.severity = severity;
+    }
+
+    // Only show active alerts (endsAt is null or in the future)
+    where.OR = [
+      { endsAt: null },
+      { endsAt: { gte: new Date() } },
+    ];
+
+    const alerts = await prisma.alert.findMany({
+      where,
+      include: { state: { select: { name: true, abbr: true } } },
+      orderBy: [{ severity: 'desc' }, { startsAt: 'desc' }],
+    });
+
+    res.json(alerts);
+  } catch (err) {
+    next(err);
+  }
+});
+
+// GET /api/alerts/:id
+router.get('/:id', async (req, res, next) => {
+  try {
+    const alert = await prisma.alert.findUnique({
+      where: { id: req.params.id },
+      include: { state: { select: { name: true, abbr: true } } },
+    });
+    if (!alert) return res.status(404).json({ error: 'Alert not found.' });
+    res.json(alert);
+  } catch (err) {
+    next(err);
+  }
+});
+
+module.exports = router;