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/.env.example

@@ -1,22 +1,28 @@
-# Database Configuration
-DATABASE_URL=postgresql://postgres:password@db:5432/vip_coordinator
-
-# Redis Configuration
-REDIS_URL=redis://redis:6379
-
-# Authentication Configuration
-JWT_SECRET=your-super-secure-jwt-secret-key-change-in-production
-SESSION_SECRET=your-super-secure-session-secret-change-in-production
-
-# Google OAuth Configuration
-GOOGLE_CLIENT_ID=your-google-client-id-from-console
-GOOGLE_CLIENT_SECRET=your-google-client-secret-from-console
-
-# Frontend URL
+# ============================================
+# Application Configuration
+# ============================================
+PORT=3000
+NODE_ENV=development
 FRONTEND_URL=http://localhost:5173
 
-# Flight API Configuration
-AVIATIONSTACK_API_KEY=your-aviationstack-api-key
+# ============================================
+# Database Configuration
+# ============================================
+DATABASE_URL="postgresql://postgres:changeme@localhost:5432/vip_coordinator"
 
-# Admin Configuration
-ADMIN_PASSWORD=admin123
+# ============================================
+# Redis Configuration (Optional)
+# ============================================
+REDIS_URL="redis://localhost:6379"
+
+# ============================================
+# Auth0 Configuration
+# ============================================
+AUTH0_DOMAIN="your-tenant.us.auth0.com"
+AUTH0_AUDIENCE="https://your-api-identifier"
+AUTH0_ISSUER="https://your-tenant.us.auth0.com/"
+
+# ============================================
+# Flight Tracking API (Optional)
+# ============================================
+AVIATIONSTACK_API_KEY="your-aviationstack-api-key"