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/pgadmin_servers.json

@@ -0,0 +1,24 @@
+{
+    "Servers": {
+        "1": {
+            "Name": "SerpentRace PostgreSQL Dev",
+            "Group": "Development",
+            "Host": "postgres",
+            "Port": 5432,
+            "MaintenanceDB": "serpentrace",
+            "Username": "postgres",
+            "UseSSLMode": "prefer",
+            "SSLMode": "prefer",
+            "SSLCompression": 0,
+            "Timeout": 10,
+            "UseSSHTunnel": 0,
+            "TunnelPort": "22",
+            "TunnelAuthentication": 0,
+            "KerberosAuthentication": false,
+            "ConnectionParameters": {
+                "sslmode": "prefer",
+                "connect_timeout": "10"
+            }
+        }
+    }
+}