test(auth): Add tests for AuthService and Auth validations

frontend/package.json

@@ -12,6 +12,7 @@
   },
   "dependencies": {
     "@tailwindcss/vite": "^4.1.18",
+    "axios": "^1.13.5",
     "class-variance-authority": "^0.7.1",
     "clsx": "^2.1.1",
     "lucide-react": "^0.563.0",
@@ -19,7 +20,8 @@
     "react": "^19.2.0",
     "react-dom": "^19.2.0",
     "tailwind-merge": "^3.4.0",
-    "tailwindcss": "^4.1.18"
+    "tailwindcss": "^4.1.18",
+    "zod": "^4.3.6"
   },
   "devDependencies": {
     "@eslint/js": "^9.39.1",