feat: estrutura inicial do gerenciador de subdomínios

- backend Express com endpoints Hostinger DNS API
- frontend React+Vite+Tailwind com card de API key
- docker-compose (frontend:3014, backend:8019, nginx:8021)
- Traefik label para subdominio.clube67.com

frontend/package.json

@@ -0,0 +1,24 @@
+{
+  "name": "subdominio-frontend",
+  "private": true,
+  "version": "1.0.0",
+  "type": "module",
+  "scripts": {
+    "dev": "vite",
+    "build": "vite build",
+    "preview": "vite preview"
+  },
+  "dependencies": {
+    "react": "^19.0.0",
+    "react-dom": "^19.0.0"
+  },
+  "devDependencies": {
+    "@tailwindcss/vite": "^4.2.0",
+    "@vitejs/plugin-react": "^5.0.0",
+    "@types/react": "^19.0.0",
+    "@types/react-dom": "^19.0.0",
+    "tailwindcss": "^4.2.0",
+    "typescript": "~5.8.2",
+    "vite": "^6.2.0"
+  }
+}