fix basepath

frontend/vite.config.ts

@@ -3,11 +3,12 @@ import vue from '@vitejs/plugin-vue';
 import { resolve } from 'path';
 
 // https://vitejs.dev/config/
-export default defineConfig({
+export default defineConfig(({ mode }) => ({
   plugins: [vue()],
+  base: mode === 'production' ? '/covergen/' : '/',
   resolve: {
     alias: {
       '@': resolve(__dirname, './src'),
     },
   },
-});
+}));