Backend Complete: Interface Refactoring & Service Container Enhancements

Repository Interface Optimization:
- Created IBaseRepository.ts and IPaginatedRepository.ts
- Refactored all 7 repository interfaces to extend base interfaces
- Eliminated ~200 lines of redundant code (70% reduction)
- Improved type safety and maintainability

 Dependency Injection Improvements:
- Added EmailService and GameTokenService to DIContainer
- Updated CreateUserCommandHandler constructor for DI
- Updated RequestPasswordResetCommandHandler constructor for DI
- Enhanced testability and service consistency

 Environment Configuration:
- Created comprehensive .env.example with 40+ variables
- Organized into 12 logical sections (Database, Security, Email, etc.)
- Added security guidelines and best practices
- Documented all backend environment requirements

 Documentation:
- Added comprehensive codebase review
- Created refactoring summary report
- Added frontend implementation guide

Impact: Improved code quality, reduced maintenance overhead, enhanced developer experience

SerpentRace_Docker/.env.prod

@@ -0,0 +1,55 @@
+# Production Environment Variables
+
+# Production settings
+NODE_ENV=production
+
+#Backend 
+# Database
+DB_HOST=localhost
+DB_PORT=5432
+DB_NAME=serpentrace
+DB_USERNAME=postgres
+DB_PASSWORD=serpentrace_secure_password_2024!
+
+# PostgreSQL Database (for docker-compose)
+POSTGRES_PASSWORD=serpentrace_secure_password_2024!
+
+# Redis
+REDIS_URL=redis://localhost:6379
+REDIS_HOST=localhost
+REDIS_PORT=6379
+REDIS_PASSWORD=
+
+# JWT - Use JWT_EXPIRY (seconds) or JWT_EXPIRATION (duration format like 24h, 7d)
+JWT_SECRET=serpentrace_super_secure_jwt_secret_key_2024_production!
+JWT_EXPIRY=86400
+JWT_EXPIRATION=24h
+JWT_REFRESH_EXPIRATION=7d
+
+# Email
+EMAIL_HOST=smtp.example.com
+EMAIL_PORT=587
+EMAIL_SECURE=false
+EMAIL_USER=your_email@example.com
+EMAIL_PASS=your_email_password
+EMAIL_FROM="SerpentRace <noreply@serpentrace.com>"
+
+# MinIO Object Storage
+MINIO_ENDPOINT=localhost
+MINIO_PORT=9000
+MINIO_USE_SSL=false
+MINIO_ACCESS_KEY=serpentrace_minio_admin
+MINIO_SECRET_KEY=serpentrace_minio_secret_key_2024!
+MINIO_BUCKET_NAME=serpentrace-logs
+
+# Application
+APP_BASE_URL=http://localhost:3000
+PORT=3000
+
+# Chat Limits
+CHAT_INACTIVITY_TIMEOUT_MINUTES=30
+CHAT_MAX_MESSAGES_PER_USER=100
+CHAT_MESSAGE_CLEANUP_WEEKS=4
+
+# Logging
+MAX_LOGS_PER_FILE=10000