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/README.md

@@ -0,0 +1,56 @@
+# Beach Litter Mapping API
+
+Backend API server for the Beach Litter Mapping Platform.
+
+## Setup
+
+1. Install dependencies:
+```bash
+cd server
+npm install
+```
+
+2. Configure environment variables:
+```bash
+cp .env.example .env
+# Edit .env with your configuration
+```
+
+3. Set up the database:
+```bash
+npm run prisma:generate
+npm run prisma:migrate
+```
+
+4. Start the development server:
+```bash
+npm run dev
+```
+
+The API will be available at `http://localhost:3000`
+
+## API Endpoints
+
+### Reports
+
+- `POST /api/reports/upload` - Upload a photo (requires auth)
+- `POST /api/reports` - Create a new report (requires auth)
+- `GET /api/reports` - Get all reports (with optional filters)
+- `GET /api/reports/:id` - Get a single report
+- `DELETE /api/reports/:id` - Delete a report (requires auth, owner only)
+
+### Health Check
+
+- `GET /health` - Server health status
+
+## Environment Variables
+
+See `.env.example` for required environment variables.
+
+## Database
+
+The API uses MySQL 8.0+ with Prisma ORM. Connection details are configured in the `.env` file.
+
+## Authentication
+
+Authentication is handled by Clerk. Protected endpoints require a Bearer token in the Authorization header.