feat: add Easypanel persistent volume support for Astro DB

- Change Dockerfile from nginx (static) to Node.js (SSR)
- Add @astrojs/node adapter for SSR mode
- Add OUT_DIR=/data for persistent SQLite storage
- Add .env.example with persistent storage config
- Update README with Easypanel deployment instructions
- Database persists across redeployments at /data/astro.db

skills/website-creator/templates/astro-tina-starter/package.json

@@ -16,6 +16,7 @@
   "dependencies": {
     "@astrojs/check": "^0.9.4",
     "@astrojs/db": "^0.14.3",
+    "@astrojs/node": "^9.0.0",
     "@nanostores/react": "^0.7.3",
     "@tailwindcss/typography": "^0.5.15",
     "@tailwindcss/vite": "^4.0.0",