refactor: splitting and reorganizing style files

packages/styles/vite.config.mts

@@ -1,3 +1,16 @@
 import { defineConfig } from '@vben/vite-config';
 
-export default defineConfig();
+export default defineConfig({
+  vite: {
+    build: {
+      lib: {
+        entry: {
+          antd: 'src/antd/index.ts',
+          index: 'src/index.ts',
+        },
+        fileName: (_format, name) => `${name}.mjs`,
+      },
+    },
+    publicDir: 'src/bem',
+  },
+});