build(config): update API endpoint to production URL and remove dev proxy

Changes the default API base URL from local development server (127.0.0.1:8080) to the production endpoint (bbs.littlelan.cn) and removes the Vite dev server proxy configuration, as the application now connects directly to the production API.

vite.config.ts

@@ -10,12 +10,5 @@ export default defineConfig({
       '@': path.resolve(__dirname, './src'),
     },
   },
-  server: {
-    proxy: {
-      '/api': {
-        target: 'http://127.0.0.1:8080',
-        changeOrigin: true,
-      },
-    },
-  },
+  server: {},
 })