chore: upgrade Inspector plugin (#352)

* fix: only register `Inspector` plugin in dev mode

* chore: upgrade `Inspector` plugin

package.json

@@ -49,7 +49,7 @@
     "vite-plugin-md": "^0.13.0",
     "vite-plugin-pages": "^0.23.0",
     "vite-plugin-pwa": "^0.12.0",
-    "vite-plugin-vue-inspector": "0.5.6",
+    "vite-plugin-vue-inspector": "0.5.7",
     "vite-plugin-vue-layouts": "^0.6.0",
     "vite-ssg": "^0.19.2",
     "vite-ssg-sitemap": "^0.2.6",