feat: Configure database with Prisma and MySQL spatial support (Task 22)

- Set up MySQL 8.0+ with spatial data support (POINT SRID 4326)
- Created Prisma schema with all models (User, Report, Event, etc.)
- Added Clerk authentication support (clerk_id field)
- Configured spatial indexes on location fields for performance
- Created database migrations and applied to MySQL
- Built spatial query utilities for geographical operations
- Added database connection singleton and health checks
- Created comprehensive documentation and test scripts

Requirements: 1.1, 2.1, 3.2, 4.1

server/DATABASE_SETUP.md

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+# Database Setup Complete ✅
+
+## Task 22: Configure database with Prisma and MySQL spatial support
+
+### Completed Items
+
+✅ **MySQL 8.0+ with spatial data support**
+- Connected to MySQL 9.4.0 at 192.168.4.20:3306
+- Database: beach_litter_mapping
+- Spatial functions verified and working
+
+✅ **Prisma schema with all models**
+- User (with Clerk authentication support via clerk_id)
+- Report (with spatial location data)
+- Event (with spatial location data)
+- EventRegistration
+- Verification
+- EnvironmentalConcern
+- Hotspot (with spatial location data)
+
+✅ **MySQL POINT spatial types configured**
+- Reports table: location POINT SRID 4326
+- Events table: location POINT SRID 4326
+- Hotspots table: location POINT SRID 4326
+- All spatial columns use WGS 84 coordinate system (SRID 4326)
+
+✅ **Database migrations created and applied**
+- Migration 20241116000000_initial_setup: Initial schema
+- Migration 20241116000001_add_clerk_auth: Added Clerk authentication support
+- Migrations applied successfully to database
+
+✅ **Database indexes including spatial indexes**
+- Spatial indexes on all location POINT columns (reports, events, hotspots)
+- Standard indexes on foreign keys, dates, enums
+- Unique indexes on email, username, clerk_id
+- Composite indexes on latitude/longitude pairs
+
+### Files Created
+
+1. **server/prisma/schema.prisma** - Updated with Clerk auth and spatial types
+2. **server/prisma/migrations/** - Migration files for database setup
+3. **server/prisma/README.md** - Comprehensive database documentation
+4. **server/src/config/database.ts** - Prisma client singleton
+5. **server/src/utils/spatial.ts** - Spatial query utilities
+6. **server/src/scripts/testDatabase.ts** - Database verification script
+
+### Key Features
+
+**Clerk Authentication Integration:**
+- User table includes clerk_id field for Clerk integration
+- Removed password_hash dependency (handled by Clerk)
+- Ready for Clerk webhook synchronization
+
+**Spatial Query Support:**
+- Find reports/events within radius
+- Calculate distances between points
+- Identify hotspot clusters
+- Validate Irish coordinates
+- Bounding box queries
+
+**Performance Optimizations:**
+- Spatial indexes for fast geographical queries
+- Standard indexes on frequently queried fields
+- Connection pooling via Prisma
+- Query logging in development mode
+
+### Database Connection
+
+```env
+DATABASE_URL="mysql://beach_litter_user:BeachClean2024!@192.168.4.20:3306/beach_litter_mapping"
+```
+
+### Verification
+
+Run the test script to verify setup:
+```bash
+npx tsx src/scripts/testDatabase.ts
+```
+
+All tests passing:
+- ✅ Database connection
+- ✅ MySQL 9.4.0 detected
+- ✅ Spatial functions working
+- ✅ 7 tables created
+- ✅ 3 spatial indexes configured
+- ✅ Clerk authentication ready
+- ✅ Coordinate validation working
+
+### Next Steps
+
+The database is fully configured and ready for:
+- Task 23: Implement authentication system (Clerk integration)
+- Task 24: Build report API endpoints
+- Task 25: Implement file upload and EXIF processing
+
+### Requirements Satisfied
+
+- ✅ Requirement 1.1: GPS coordinate capture with spatial support
+- ✅ Requirement 2.1: Interactive map data storage
+- ✅ Requirement 3.2: Hotspot calculation infrastructure
+- ✅ Requirement 4.1: Event location storage