feat: add nuxt sdk (#260)

* wip

* fix: improve api route for nuxt

packages/sdks/nuxt/src/runtime/plugin.client.ts

@@ -0,0 +1,30 @@
+import { OpenPanel } from '@openpanel/web';
+import { defineNuxtPlugin, useRuntimeConfig } from '#app';
+import type { ModuleOptions } from '../types';
+
+declare module '#app' {
+  interface NuxtApp {
+    $openpanel: OpenPanel;
+  }
+}
+
+declare module '@vue/runtime-core' {
+  interface ComponentCustomProperties {
+    $openpanel: OpenPanel;
+  }
+}
+
+export default defineNuxtPlugin({
+  name: 'openpanel',
+  parallel: true,
+  setup() {
+    const config = useRuntimeConfig().public.openpanel as ModuleOptions;
+    const op = new OpenPanel(config);
+
+    return {
+      provide: {
+        openpanel: op,
+      },
+    };
+  },
+});