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/Application/DTOs/Mappers/UserMapper.test.ts

@@ -0,0 +1,164 @@
+import { UserMapper } from '../../../../src/Application/DTOs/Mappers/UserMapper';
+import { UserAggregate, UserState } from '../../../../src/Domain/User/UserAggregate';
+import { createMockUser } from '../../../testUtils';
+
+describe('UserMapper', () => {
+  describe('toShortDto', () => {
+    it('should map UserAggregate to ShortUserDto correctly', () => {
+      // Arrange
+      const user = createMockUser({
+        id: 'user-123',
+        username: 'testuser',
+        email: 'test@example.com',
+        fname: 'John',
+        lname: 'Doe',
+        state: UserState.VERIFIED_REGULAR
+      });
+
+      // Act
+      const result = UserMapper.toShortDto(user);
+
+      // Assert
+      expect(result).toEqual({
+        id: 'user-123',
+        username: 'testuser',
+        state: UserState.VERIFIED_REGULAR,
+        authLevel: 0
+      });
+      // Should not contain sensitive information
+      expect(result).not.toHaveProperty('email');
+      expect(result).not.toHaveProperty('password');
+      expect(result).not.toHaveProperty('token');
+    });
+
+    it('should map admin user with authLevel 1', () => {
+      // Arrange
+      const adminUser = createMockUser({
+        id: 'admin-123',
+        username: 'admin',
+        email: 'admin@example.com',
+        fname: 'Admin',
+        lname: 'User',
+        state: UserState.ADMIN
+      });
+
+      // Act
+      const result = UserMapper.toShortDto(adminUser);
+
+      // Assert
+      expect(result).toEqual({
+        id: 'admin-123',
+        username: 'admin',
+        state: UserState.ADMIN,
+        authLevel: 1
+      });
+    });
+  });
+
+  describe('toDetailDto', () => {
+    it('should map UserAggregate to DetailUserDto correctly', () => {
+      // Arrange
+      const user = createMockUser({
+        id: 'user-123',
+        orgid: 'org-456',
+        username: 'testuser',
+        email: 'test@example.com',
+        fname: 'John',
+        lname: 'Doe',
+        token: 'verification-token',
+        type: 'admin',
+        phone: '+1234567890',
+        state: UserState.ADMIN
+      });
+
+      // Act
+      const result = UserMapper.toDetailDto(user);
+
+      // Assert
+      expect(result).toEqual({
+        id: 'user-123',
+        orgid: 'org-456',
+        username: 'testuser',
+        email: 'test@example.com',
+        fname: 'John',
+        lname: 'Doe',
+        code: 'verification-token',
+        type: 'admin',
+        phone: '+1234567890',
+        state: UserState.ADMIN
+      });
+      // Should not contain password
+      expect(result).not.toHaveProperty('password');
+    });
+
+    it('should handle null values correctly', () => {
+      // Arrange
+      const user = createMockUser({
+        id: 'user-123',
+        orgid: null,
+        username: 'testuser',
+        email: 'test@example.com',
+        fname: 'John',
+        lname: 'Doe',
+        token: null,
+        type: 'regular',
+        phone: null,
+        state: UserState.VERIFIED_REGULAR
+      });
+
+      // Act
+      const result = UserMapper.toDetailDto(user);
+
+      // Assert
+      expect(result.orgid).toBeNull();
+      expect(result.code).toBeNull();
+      expect(result.phone).toBeNull();
+    });
+  });
+
+  describe('toShortDtoList', () => {
+    it('should map array of UserAggregate to ShortUserDto array', () => {
+      // Arrange
+      const users = [
+        createMockUser({ id: 'user-1', username: 'user1', state: UserState.VERIFIED_REGULAR }),
+        createMockUser({ id: 'user-2', username: 'user2', state: UserState.REGISTERED_NOT_VERIFIED }),
+        createMockUser({ id: 'user-3', username: 'user3', state: UserState.DEACTIVATED })
+      ];
+
+      // Act
+      const result = UserMapper.toShortDtoList(users);
+
+      // Assert
+      expect(result).toHaveLength(3);
+      expect(result[0]).toEqual({
+        id: 'user-1',
+        username: 'user1',
+        state: UserState.VERIFIED_REGULAR,
+        authLevel: 0
+      });
+      expect(result[1]).toEqual({
+        id: 'user-2',
+        username: 'user2',
+        state: UserState.REGISTERED_NOT_VERIFIED,
+        authLevel: 0
+      });
+      expect(result[2]).toEqual({
+        id: 'user-3',
+        username: 'user3',
+        state: UserState.DEACTIVATED,
+        authLevel: 0
+      });
+    });
+
+    it('should handle empty array', () => {
+      // Arrange
+      const users: UserAggregate[] = [];
+
+      // Act
+      const result = UserMapper.toShortDtoList(users);
+
+      // Assert
+      expect(result).toEqual([]);
+    });
+  });
+});