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_Backend/tests/setup.ts

@@ -0,0 +1,26 @@
+// Jest test setup file
+import { jest } from '@jest/globals';
+import { LoggingService } from '../src/Application/Services/LoggingService';
+
+// Mock environment variables
+process.env.NODE_ENV = 'test';
+process.env.JWT_SECRET = 'test-jwt-secret';
+process.env.EMAIL_HOST = 'test.smtp.com';
+process.env.EMAIL_PORT = '587';
+process.env.EMAIL_USER = 'test@example.com';
+process.env.EMAIL_PASS = 'testpass';
+process.env.EMAIL_FROM = 'test@example.com';
+process.env.APP_BASE_URL = 'http://localhost:3000';
+
+// Global test timeout
+jest.setTimeout(10000);
+
+// Global cleanup to prevent Jest from hanging
+afterAll(async () => {
+  try {
+    await LoggingService.getInstance().shutdown();
+  } catch (error) {
+    // Ignore cleanup errors in tests
+    console.log('Test cleanup completed');
+  }
+});