fix: remove deleted main.css reference from nuxt.config

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: Ray0907

nuxt.config.ts

@@ -28,9 +28,7 @@ export default defineNuxtConfig({
 		{ path: '~/components', pathPrefix: false }
 	],
 
-	css: ['~/assets/css/main.css'],
-
-	routeRules: {
+routeRules: {
 		'/api/**': { cors: false }
 	},