Implement backend API and database services in Docker setup

- Added a new `api` service for the NestJS backend, including health checks and dependencies on PostgreSQL, Redis, and MinIO.
- Introduced PostgreSQL and Redis services with health checks and configurations for data persistence.
- Added MinIO for S3-compatible object storage and a one-shot service to initialize required buckets.
- Updated the Nginx configuration to proxy requests to the new backend API and MinIO storage.
- Enhanced the Dockerfile to support the new API environment variables and configurations.
- Updated the `package.json` and `package-lock.json` to include new dependencies for QR code generation and other utilities.

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/src/database/database.module.ts

@@ -0,0 +1,51 @@
+import { Module } from '@nestjs/common';
+import { TypeOrmModule } from '@nestjs/typeorm';
+import { ConfigModule, ConfigService } from '@nestjs/config';
+import { SnakeNamingStrategy } from 'typeorm-naming-strategies';
+import { Unique } from './validators/unique.validator';
+
+/**
+ * Database module.
+ * Removed the second PostHog database connection.
+ * Only the main application database is configured.
+ */
+@Module({
+  imports: [
+    TypeOrmModule.forRootAsync({
+      imports: [ConfigModule],
+      inject: [ConfigService],
+      useFactory: (configService: ConfigService) => ({
+        type: 'postgres',
+        host: configService.get('DATABASE_HOST'),
+        port: configService.get<number>('DATABASE_PORT'),
+        username: configService.get('DATABASE_USER'),
+        password: configService.get('DATABASE_PASSWORD'),
+        database: configService.get('DATABASE_NAME'),
+        namingStrategy: new SnakeNamingStrategy(),
+        entities: ['dist/**/*.entity.{ts,js}'],
+        migrations: ['dist/database/migrations/*.{ts,js}'],
+        migrationsTableName: 'typeorm_migrations',
+        autoLoadEntities: true,
+        // In production: false. In development: true for auto-schema sync.
+        synchronize: configService.get('ENVIRONMENT') === 'development',
+        connectTimeoutMS: 10_000,
+        maxQueryExecutionTime: 30_000,
+        poolSize: 50,
+        extra: {
+          poolSize: 50,
+          connectionTimeoutMillis: 5000,
+          query_timeout: 30_000,
+          statement_timeout: 30_000,
+        },
+        // No SSL for local/Docker environments
+        ssl:
+          configService.get('ENVIRONMENT') === 'local' ||
+          configService.get('ENVIRONMENT') === 'development'
+            ? false
+            : { rejectUnauthorized: false },
+      }),
+    }),
+  ],
+  providers: [Unique],
+})
+export class DatabaseModule {}