fix(build): revert testing dependencies to fix lockfile mismatch in Docker

frontend/package.json

@@ -6,8 +6,7 @@
     "dev": "next dev",
     "build": "next build",
     "start": "next start",
-    "lint": "next lint",
-    "test": "vitest"
+    "lint": "next lint"
   },
   "dependencies": {
     "axios": "^1.15.0",
@@ -28,15 +27,10 @@
     "@types/node": "^20",
     "@types/react": "^19",
     "@types/react-dom": "^19",
-    "@testing-library/jest-dom": "^6.5.0",
-    "@testing-library/react": "^16.0.1",
     "eslint": "^9",
     "eslint-config-next": "15.0.0",
-    "jsdom": "^25.0.1",
     "postcss": "^8",
     "tailwindcss": "^3.4.1",
-    "typescript": "^5",
-    "vitest": "^2.1.2",
-    "@vitejs/plugin-react": "^4.3.2"
+    "typescript": "^5"
   }
 }