Upgrade Astro to 5.11.0, Vue to 3.5.17, Prettier to 3.6.2, and update
related dependencies and lockfile. Also update @astrojs/rss,
@astrojs/vue,
@vitejs/plugin-vue-jsx, @volar/kit, and Shiki packages to latest
versions.
Add "format" script to package.json for code formatting. This ensures
compatibility, bug fixes, and improved features across the project.
