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/drivers/drivers.service.ts

@@ -0,0 +1,89 @@
+import { Injectable, NotFoundException, Logger } from '@nestjs/common';
+import { PrismaService } from '../prisma/prisma.service';
+import { CreateDriverDto, UpdateDriverDto } from './dto';
+
+@Injectable()
+export class DriversService {
+  private readonly logger = new Logger(DriversService.name);
+
+  constructor(private prisma: PrismaService) {}
+
+  async create(createDriverDto: CreateDriverDto) {
+    this.logger.log(`Creating driver: ${createDriverDto.name}`);
+
+    return this.prisma.driver.create({
+      data: createDriverDto,
+      include: { user: true },
+    });
+  }
+
+  async findAll() {
+    return this.prisma.driver.findMany({
+      where: { deletedAt: null },
+      include: {
+        user: true,
+        events: {
+          where: { deletedAt: null },
+          include: { vip: true },
+          orderBy: { startTime: 'asc' },
+        },
+      },
+      orderBy: { name: 'asc' },
+    });
+  }
+
+  async findOne(id: string) {
+    const driver = await this.prisma.driver.findFirst({
+      where: { id, deletedAt: null },
+      include: {
+        user: true,
+        events: {
+          where: { deletedAt: null },
+          include: { vip: true },
+          orderBy: { startTime: 'asc' },
+        },
+      },
+    });
+
+    if (!driver) {
+      throw new NotFoundException(`Driver with ID ${id} not found`);
+    }
+
+    return driver;
+  }
+
+  async update(id: string, updateDriverDto: UpdateDriverDto) {
+    const driver = await this.findOne(id);
+
+    this.logger.log(`Updating driver ${id}: ${driver.name}`);
+
+    return this.prisma.driver.update({
+      where: { id: driver.id },
+      data: updateDriverDto,
+      include: { user: true },
+    });
+  }
+
+  async remove(id: string, hardDelete = false) {
+    const driver = await this.findOne(id);
+
+    if (hardDelete) {
+      this.logger.log(`Hard deleting driver: ${driver.name}`);
+      return this.prisma.driver.delete({
+        where: { id: driver.id },
+      });
+    }
+
+    this.logger.log(`Soft deleting driver: ${driver.name}`);
+    return this.prisma.driver.update({
+      where: { id: driver.id },
+      data: { deletedAt: new Date() },
+    });
+  }
+
+  async getSchedule(id: string) {
+    const driver = await this.findOne(id);
+
+    return driver.events;
+  }
+}