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/src/config/database.ts

@@ -1,7 +1,55 @@
+/**
+ * Database configuration and Prisma client singleton
+ */
+
 import { PrismaClient } from '@prisma/client';
 
-const prisma = new PrismaClient({
-  log: process.env.NODE_ENV === 'development' ? ['query', 'error', 'warn'] : ['error'],
-});
+// PrismaClient is attached to the `global` object in development to prevent
+// exhausting your database connection limit.
+const globalForPrisma = global as unknown as { prisma: PrismaClient };
+
+export const prisma =
+  globalForPrisma.prisma ||
+  new PrismaClient({
+    log: process.env.NODE_ENV === 'development' ? ['query', 'error', 'warn'] : ['error'],
+  });
+
+if (process.env.NODE_ENV !== 'production') {
+  globalForPrisma.prisma = prisma;
+}
+
+/**
+ * Connect to the database
+ */
+export async function connectDatabase() {
+  try {
+    await prisma.$connect();
+    console.log('✅ Database connected successfully');
+  } catch (error) {
+    console.error('❌ Database connection failed:', error);
+    process.exit(1);
+  }
+}
+
+/**
+ * Disconnect from the database
+ */
+export async function disconnectDatabase() {
+  await prisma.$disconnect();
+  console.log('Database disconnected');
+}
+
+/**
+ * Health check for database connection
+ */
+export async function checkDatabaseHealth(): Promise<boolean> {
+  try {
+    await prisma.$queryRaw`SELECT 1`;
+    return true;
+  } catch (error) {
+    console.error('Database health check failed:', error);
+    return false;
+  }
+}
 
 export default prisma;