Set up backend API server with Express and Prisma

- Initialize Node.js/Express backend project structure
- Configure TypeScript for backend development
- Set up Prisma ORM with MySQL database schema
- Implement authentication middleware with Clerk
- Create photo upload endpoint with EXIF extraction
- Build report CRUD endpoints (create, read, delete)
- Add file upload handling with Multer
- Configure CORS and security middleware (helmet)
- Set up error handling and validation
- Create development environment configuration

Task 21 complete: Backend foundation ready for report submissions

server/.env.example

@@ -0,0 +1,14 @@
+# Database
+DATABASE_URL="mysql://beach_litter_user:BeachClean2024!@192.168.4.20:3306/beach_litter_mapping"
+
+# Clerk Authentication
+CLERK_SECRET_KEY="sk_test_your_secret_key_here"
+CLERK_WEBHOOK_SECRET="whsec_your_webhook_secret_here"
+
+# Server
+PORT=3000
+NODE_ENV=development
+
+# File Upload
+UPLOAD_DIR=./uploads
+MAX_FILE_SIZE=5242880