fix(frontend): prettier config

frontend/package.json

@@ -9,7 +9,8 @@
     "build": "next build",
     "build:embed": "NEXT_STANDALONE_EXPORT=true next build",
     "start": "next start -p 3010",
-    "lint": "eslint"
+    "lint": "eslint",
+    "format": "prettier --write ."
   },
   "dependencies": {
     "@codemirror/lang-sql": "^6.10.0",
@@ -58,6 +59,7 @@
     "next": "16.2.7",
     "next-themes": "^0.4.6",
     "pinyin-match": "^1.2.10",
+    "prettier": "^3.9.5",
     "radix-ui": "^1.4.3",
     "react": "19.2.3",
     "react-day-picker": "^9.11.1",