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.dev

@@ -0,0 +1,17 @@
+# Development Environment Variables
+POSTGRES_PASSWORD=postgres
+JWT_SECRET=dev_jwt_secret_change_in_production_please_use_a_long_random_string
+JWT_EXPIRATION=24h
+JWT_REFRESH_EXPIRATION=7d
+MINIO_ACCESS_KEY=serpentrace
+MINIO_SECRET_KEY=serpentrace123!
+
+# Optional: Email configuration for development
+EMAIL_HOST=
+EMAIL_PORT=
+EMAIL_USER=
+EMAIL_PASS=
+EMAIL_FROM=
+
+# Optional: Other development settings
+NODE_ENV=development