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/src/app.module.ts

@@ -0,0 +1,46 @@
+import { Module } from '@nestjs/common';
+import { ConfigModule } from '@nestjs/config';
+import { APP_GUARD } from '@nestjs/core';
+import { AppController } from './app.controller';
+import { AppService } from './app.service';
+import { PrismaModule } from './prisma/prisma.module';
+import { AuthModule } from './auth/auth.module';
+import { UsersModule } from './users/users.module';
+import { VipsModule } from './vips/vips.module';
+import { DriversModule } from './drivers/drivers.module';
+import { VehiclesModule } from './vehicles/vehicles.module';
+import { EventsModule } from './events/events.module';
+import { FlightsModule } from './flights/flights.module';
+import { JwtAuthGuard } from './auth/guards/jwt-auth.guard';
+
+@Module({
+  imports: [
+    // Load environment variables
+    ConfigModule.forRoot({
+      isGlobal: true,
+      envFilePath: '.env',
+    }),
+
+    // Core modules
+    PrismaModule,
+    AuthModule,
+
+    // Feature modules
+    UsersModule,
+    VipsModule,
+    DriversModule,
+    VehiclesModule,
+    EventsModule,
+    FlightsModule,
+  ],
+  controllers: [AppController],
+  providers: [
+    AppService,
+    // Apply JWT auth guard globally (unless @Public() is used)
+    {
+      provide: APP_GUARD,
+      useClass: JwtAuthGuard,
+    },
+  ],
+})
+export class AppModule {}