Major Enhancement: NestJS Migration + CASL Authorization + Error Handling

Complete rewrite from Express to NestJS with enterprise-grade features:

## Backend Improvements
- Migrated from Express to NestJS 11.0.1 with TypeScript
- Implemented Prisma ORM 7.3.0 for type-safe database access
- Added CASL authorization system replacing role-based guards
- Created global exception filters with structured logging
- Implemented Auth0 JWT authentication with Passport.js
- Added vehicle management with conflict detection
- Enhanced event scheduling with driver/vehicle assignment
- Comprehensive error handling and logging

## Frontend Improvements
- Upgraded to React 19.2.0 with Vite 7.2.4
- Implemented CASL-based permission system
- Added AbilityContext for declarative permissions
- Created ErrorHandler utility for consistent error messages
- Enhanced API client with request/response logging
- Added War Room (Command Center) dashboard
- Created VIP Schedule view with complete itineraries
- Implemented Vehicle Management UI
- Added mock data generators for testing (288 events across 20 VIPs)

## New Features
- Vehicle fleet management (types, capacity, status tracking)
- Complete 3-day Jamboree schedule generation
- Individual VIP schedule pages with PDF export (planned)
- Real-time War Room dashboard with auto-refresh
- Permission-based navigation filtering
- First user auto-approval as administrator

## Documentation
- Created CASL_AUTHORIZATION.md (comprehensive guide)
- Created ERROR_HANDLING.md (error handling patterns)
- Updated CLAUDE.md with new architecture
- Added migration guides and best practices

## Technical Debt Resolved
- Removed custom authentication in favor of Auth0
- Replaced role checks with CASL abilities
- Standardized error responses across API
- Implemented proper TypeScript typing
- Added comprehensive logging

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

backend/prisma/seed.ts

@@ -0,0 +1,165 @@
+import { PrismaClient, Role, Department, ArrivalMode, EventType, EventStatus } from '@prisma/client';
+
+const prisma = new PrismaClient();
+
+async function main() {
+  console.log('🌱 Seeding database...');
+
+  // Clean up existing data (careful in production!)
+  await prisma.scheduleEvent.deleteMany({});
+  await prisma.flight.deleteMany({});
+  await prisma.driver.deleteMany({});
+  await prisma.vIP.deleteMany({});
+  await prisma.user.deleteMany({});
+
+  console.log('✅ Cleared existing data');
+
+  // Create sample users
+  const admin = await prisma.user.create({
+    data: {
+      auth0Id: 'auth0|admin-sample-id',
+      email: 'admin@example.com',
+      name: 'Admin User',
+      role: Role.ADMINISTRATOR,
+      isApproved: true,
+    },
+  });
+
+  const coordinator = await prisma.user.create({
+    data: {
+      auth0Id: 'auth0|coordinator-sample-id',
+      email: 'coordinator@example.com',
+      name: 'Coordinator User',
+      role: Role.COORDINATOR,
+      isApproved: true,
+    },
+  });
+
+  console.log('✅ Created sample users');
+
+  // Create sample drivers
+  const driver1 = await prisma.driver.create({
+    data: {
+      name: 'John Smith',
+      phone: '+1 (555) 123-4567',
+      department: Department.OFFICE_OF_DEVELOPMENT,
+    },
+  });
+
+  const driver2 = await prisma.driver.create({
+    data: {
+      name: 'Jane Doe',
+      phone: '+1 (555) 987-6543',
+      department: Department.ADMIN,
+    },
+  });
+
+  console.log('✅ Created sample drivers');
+
+  // Create sample VIPs
+  const vip1 = await prisma.vIP.create({
+    data: {
+      name: 'Dr. Robert Johnson',
+      organization: 'Tech Corporation',
+      department: Department.OFFICE_OF_DEVELOPMENT,
+      arrivalMode: ArrivalMode.FLIGHT,
+      airportPickup: true,
+      venueTransport: true,
+      notes: 'Prefers window seat, dietary restriction: vegetarian',
+      flights: {
+        create: [
+          {
+            flightNumber: 'AA123',
+            flightDate: new Date('2026-02-15'),
+            segment: 1,
+            departureAirport: 'JFK',
+            arrivalAirport: 'LAX',
+            scheduledDeparture: new Date('2026-02-15T08:00:00'),
+            scheduledArrival: new Date('2026-02-15T11:30:00'),
+            status: 'scheduled',
+          },
+        ],
+      },
+    },
+  });
+
+  const vip2 = await prisma.vIP.create({
+    data: {
+      name: 'Ms. Sarah Williams',
+      organization: 'Global Foundation',
+      department: Department.ADMIN,
+      arrivalMode: ArrivalMode.SELF_DRIVING,
+      expectedArrival: new Date('2026-02-16T14:00:00'),
+      airportPickup: false,
+      venueTransport: true,
+      notes: 'Bringing assistant',
+    },
+  });
+
+  console.log('✅ Created sample VIPs');
+
+  // Create sample events
+  await prisma.scheduleEvent.create({
+    data: {
+      vipId: vip1.id,
+      title: 'Airport Pickup',
+      location: 'LAX Terminal 4',
+      startTime: new Date('2026-02-15T11:30:00'),
+      endTime: new Date('2026-02-15T12:30:00'),
+      description: 'Pick up Dr. Johnson from LAX',
+      type: EventType.TRANSPORT,
+      status: EventStatus.SCHEDULED,
+      driverId: driver1.id,
+    },
+  });
+
+  await prisma.scheduleEvent.create({
+    data: {
+      vipId: vip1.id,
+      title: 'Welcome Dinner',
+      location: 'Grand Hotel Restaurant',
+      startTime: new Date('2026-02-15T19:00:00'),
+      endTime: new Date('2026-02-15T21:00:00'),
+      description: 'Welcome dinner with board members',
+      type: EventType.MEAL,
+      status: EventStatus.SCHEDULED,
+      driverId: driver2.id,
+    },
+  });
+
+  await prisma.scheduleEvent.create({
+    data: {
+      vipId: vip2.id,
+      title: 'Conference Transport',
+      location: 'Convention Center',
+      startTime: new Date('2026-02-16T14:30:00'),
+      endTime: new Date('2026-02-16T15:00:00'),
+      description: 'Transport to conference venue',
+      type: EventType.TRANSPORT,
+      status: EventStatus.SCHEDULED,
+      driverId: driver1.id,
+    },
+  });
+
+  console.log('✅ Created sample events');
+
+  console.log('\n🎉 Database seeded successfully!');
+  console.log('\nSample Users:');
+  console.log('- Admin: admin@example.com');
+  console.log('- Coordinator: coordinator@example.com');
+  console.log('\nSample VIPs:');
+  console.log('- Dr. Robert Johnson (Flight arrival)');
+  console.log('- Ms. Sarah Williams (Self-driving)');
+  console.log('\nSample Drivers:');
+  console.log('- John Smith');
+  console.log('- Jane Doe');
+}
+
+main()
+  .catch((e) => {
+    console.error('❌ Error seeding database:', e);
+    process.exit(1);
+  })
+  .finally(async () => {
+    await prisma.$disconnect();
+  });