feat: scaffold frontend (Vite + React + Vitest)

- Añade scaffold de frontend con Vite y React
- Configura Vitest y tests básicos (App, Navbar)
- Añade QueryClient y hooks/plantillas iniciales

frontend/package.json

@@ -0,0 +1,34 @@
+{
+  "name": "quasar-frontend",
+  "version": "0.0.0",
+  "private": true,
+  "packageManager": "yarn@4.12.0",
+  "scripts": {
+    "dev": "vite",
+    "build": "vite build",
+    "preview": "vite preview",
+    "test": "vitest",
+    "test:run": "vitest run",
+    "lint": "echo \"No lint configured\"",
+    "format": "prettier --write ."
+  },
+  "dependencies": {
+    "@tanstack/react-query": "^4.34.0",
+    "react": "^18.2.0",
+    "react-dom": "^18.2.0"
+  },
+  "devDependencies": {
+    "@testing-library/jest-dom": "^6.0.0",
+    "@testing-library/react": "^14.0.0",
+    "@types/react": "^18.2.21",
+    "@types/react-dom": "^18.2.7",
+    "@vitejs/plugin-react": "^4.0.0",
+    "autoprefixer": "^10.4.14",
+    "jsdom": "^22.1.0",
+    "postcss": "^8.4.24",
+    "tailwindcss": "^3.4.7",
+    "typescript": "^5.2.2",
+    "vite": "^5.1.0",
+    "vitest": "^0.34.1"
+  }
+}