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>

frontend/src/pages/Login.tsx

@@ -0,0 +1,45 @@
+import { useEffect } from 'react';
+import { useNavigate } from 'react-router-dom';
+import { useAuth } from '@/contexts/AuthContext';
+import { Plane } from 'lucide-react';
+
+export function Login() {
+  const { isAuthenticated, loginWithRedirect } = useAuth();
+  const navigate = useNavigate();
+
+  useEffect(() => {
+    if (isAuthenticated) {
+      navigate('/dashboard');
+    }
+  }, [isAuthenticated, navigate]);
+
+  return (
+    <div className="min-h-screen flex items-center justify-center bg-gradient-to-br from-blue-50 to-indigo-100">
+      <div className="max-w-md w-full bg-white rounded-lg shadow-xl p-8">
+        <div className="text-center mb-8">
+          <div className="inline-block p-3 bg-primary/10 rounded-full mb-4">
+            <Plane className="h-12 w-12 text-primary" />
+          </div>
+          <h1 className="text-3xl font-bold text-gray-900 mb-2">
+            VIP Coordinator
+          </h1>
+          <p className="text-gray-600">
+            Transportation logistics and event coordination
+          </p>
+        </div>
+
+        <button
+          onClick={() => loginWithRedirect()}
+          className="w-full bg-primary text-primary-foreground py-3 px-4 rounded-lg font-medium hover:bg-primary/90 transition-colors"
+        >
+          Sign In with Auth0
+        </button>
+
+        <div className="mt-6 text-center text-sm text-gray-500">
+          <p>First user becomes administrator</p>
+          <p>Subsequent users require admin approval</p>
+        </div>
+      </div>
+    </div>
+  );
+}