feat: add custom Nuxt client

tsup.config.ts

@@ -1,11 +1,11 @@
 import { defineConfig } from 'tsup'
 
 export default defineConfig({
-  entry: ['src/index.ts'],
+  entry: ['src/index.ts', 'src/client/index.ts'],
   format: ['cjs', 'esm'],
   splitting: false,
   clean: true,
-  external: ['#app', '#imports'],
+  external: ['#app', '#imports', /@trpc\/client/, /@trpc\/server/],
   dts: true,
   outExtension ({ format }) {
     return {