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/package.json

@@ -0,0 +1,88 @@
+{
+  "name": "serpentrace_backend",
+  "version": "1.0.0",
+  "description": "",
+  "license": "ISC",
+  "author": "",
+  "type": "commonjs",
+  "main": "index.js",
+  "scripts": {
+    "test": "jest",
+    "test:watch": "jest --watch",
+    "test:coverage": "jest --coverage",
+    "test:redis": "jest --testNamePattern=\"RedisService\"",
+    "start": "node ./dist/Api/index.js",
+    "dev": "nodemon --watch src --ext ts,json --exec ts-node ./src/Api/index.ts",
+    "build": "npm run build:clean && npm run build:compile && npm run build:copy-assets",
+    "build:clean": "rimraf dist",
+    "build:compile": "tsc",
+    "build:copy-assets": "node scripts/copy-assets.js",
+    "build:production": "npm run build:clean && npm run lint && npm run test && npm run migration:run && npm run build:compile && npm run build:copy-assets",
+    "build:docker": "npm run build:clean && npm run build:compile && npm run build:copy-assets",
+    "build:advanced": "ts-node scripts/build.ts",
+    "build:advanced:prod": "ts-node scripts/build.ts --production --migrations --test",
+    "build:advanced:ci": "ts-node scripts/build.ts --production --migrations --test --skip-lint",
+    "deploy": "node -e \"console.log('Use deploy.bat on Windows or deploy.sh on Linux/Mac')\"",
+    "deploy:prod": "npm run build:production && echo 'Build completed - ready for deployment'",
+    "build:help": "node scripts/build-help.js",
+    "build:status": "node scripts/build-help.js --status",
+    "build:quick": "node scripts/build-help.js --quick",
+    "prebuild": "npm run lint",
+    "postbuild": "echo 'Build completed successfully!'",
+    "lint": "echo 'Linting...' && echo 'No linter configured - add ESLint if needed'",
+    "migration:create": "ts-node -r tsconfig-paths/register ./node_modules/typeorm/cli migration:create",
+    "migration:generate": "ts-node -r tsconfig-paths/register ./node_modules/typeorm/cli -d ./src/Infrastructure/ormconfig.ts migration:generate",
+    "migration:run": "ts-node -r tsconfig-paths/register ./node_modules/typeorm/cli -d ./src/Infrastructure/ormconfig.ts migration:run",
+    "migration:revert": "ts-node -r tsconfig-paths/register ./node_modules/typeorm/cli -d ./src/Infrastructure/ormconfig.ts migration:revert",
+    "migration:show": "ts-node -r tsconfig-paths/register ./node_modules/typeorm/cli -d ./src/Infrastructure/ormconfig.ts migration:show",
+    "migration:full": "ts-node scripts/generate-migration.ts",
+    "typecheck": "tsc --noEmit",
+    "watch": "tsc --watch"
+  },
+  "dependencies": {
+    "@types/multer": "^2.0.0",
+    "@types/nodemailer": "^7.0.1",
+    "@types/uuid": "^10.0.0",
+    "bcrypt": "^6.0.0",
+    "cookie-parser": "^1.4.7",
+    "express": "^5.1.0",
+    "helmet": "^8.1.0",
+    "jsonwebtoken": "^9.0.2",
+    "minio": "^8.0.5",
+    "multer": "^2.0.2",
+    "nodemailer": "^7.0.5",
+    "pg": "^8.16.3",
+    "redis": "^5.8.1",
+    "socket.io": "^4.8.1",
+    "tsconfig-paths": "^4.2.0",
+    "typeorm": "^0.3.26",
+    "uuid": "^11.1.0",
+    "winston": "^3.17.0",
+    "swagger-jsdoc": "^6.2.8",
+    "swagger-ui-express": "^5.0.1"
+  },
+  "devDependencies": {
+    "@jest/globals": "^30.0.5",
+    "@types/bcrypt": "^6.0.0",
+    "@types/cookie-parser": "^1.4.9",
+    "@types/express": "^5.0.3",
+    "@types/jest": "^30.0.0",
+    "@types/jsonwebtoken": "^9.0.10",
+    "@types/node": "^24.3.3",
+    "@types/pg": "^8.15.5",
+    "@types/redis": "^4.0.10",
+    "@types/socket.io": "^3.0.1",
+    "@types/socket.io-client": "^1.4.36",
+    "@types/supertest": "^6.0.3",
+    "@types/swagger-jsdoc": "^6.0.4",
+    "@types/swagger-ui-express": "^4.1.8",
+    "jest": "^30.0.5",
+    "nodemon": "^3.1.10",
+    "rimraf": "^5.0.10",
+    "socket.io-client": "^4.8.1",
+    "supertest": "^7.1.4",
+    "ts-jest": "^29.4.1",
+    "ts-node": "^10.9.2",
+    "typescript": "^5.9.2"
+  }
+}