feat: add support for dotenv, PostgreSQL, and Drizzle ORM in backend dependencies

backend/package.json

@@ -21,8 +21,12 @@
 	},
 	"dependencies": {
 		"@nestjs/common": "^11.0.1",
+		"@nestjs/config": "^4.0.2",
 		"@nestjs/core": "^11.0.1",
 		"@nestjs/platform-express": "^11.0.1",
+		"dotenv": "^17.2.3",
+		"drizzle-orm": "^0.45.1",
+		"pg": "^8.16.3",
 		"reflect-metadata": "^0.2.2",
 		"rxjs": "^7.8.1"
 	},
@@ -33,7 +37,9 @@
 		"@types/express": "^5.0.0",
 		"@types/jest": "^30.0.0",
 		"@types/node": "^22.10.7",
+		"@types/pg": "^8.16.0",
 		"@types/supertest": "^6.0.2",
+		"drizzle-kit": "^0.31.8",
 		"globals": "^16.0.0",
 		"jest": "^30.0.0",
 		"source-map-support": "^0.5.21",
@@ -42,6 +48,7 @@
 		"ts-loader": "^9.5.2",
 		"ts-node": "^10.9.2",
 		"tsconfig-paths": "^4.2.0",
+		"tsx": "^4.21.0",
 		"typescript": "^5.7.3",
 		"typescript-eslint": "^8.20.0"
 	},