chore/shift prettier to dev

Author: Kurtyjlee

question-service/package.json

@@ -22,7 +22,6 @@
     "express": "^4.21.0",
     "mongodb": "^6.9.0",
     "mongoose": "^8.6.3",
-    "prettier": "^3.3.3",
     "zod": "^3.23.8"
   },
   "devDependencies": {
@@ -32,6 +31,7 @@
     "@types/mongoose": "^5.11.96",
     "@types/node": "^22.6.1",
     "nodemon": "^3.1.7",
+    "prettier": "^3.3.3",
     "ts-node": "^10.9.2",
     "typescript": "^5.6.2"
   }