refactor: redesign module system

src/main.ts

@@ -1,22 +1,14 @@
 import './styles/main.postcss'
-// import routes generated by Voie
 import routes from 'vite-plugin-pages/client'
-// progress bar
-import NProgress from 'nprogress'
 import { ViteSSG } from 'vite-ssg'
-import installPlugins from './plugins'
 import App from './App.vue'
 
 // https://github.com/antfu/vite-ssg
 export const createApp = ViteSSG(
   App,
   { routes },
-  ({ app, router, isClient }) => {
-    installPlugins(app)
-
-    if (isClient) {
-      router.beforeEach(() => { NProgress.start() })
-      router.afterEach(() => { NProgress.done() })
-    }
+  (ctx) => {
+    // install all modules under `modules/`
+    Object.values(import.meta.globEager('./modules/*.ts')).map(i => i.install?.(ctx))
   },
 )