🐛(i18n): 修复按需加载下 i18n 的注册问题

package/component/src/language/index.ts

@@ -1,4 +1,5 @@
-import { createI18n } from "vue-i18n";
+import { getCurrentInstance } from "vue";
+import { createI18n, useI18n as __useI18n__ } from "vue-i18n";
 import zh_CN from "./locales/zh_CN";
 import en_US from "./locales/en_US";
 
@@ -11,4 +12,18 @@ const i18n = createI18n({
   },
 });
 
+export function useI18n() {
+  let i18nInstance;
+  const app = getCurrentInstance()?.appContext.app;
+
+  try {
+    i18nInstance = __useI18n__();
+  } catch (e) {
+    app?.use(i18n);
+    i18nInstance = __useI18n__();
+  }
+
+  return i18nInstance;
+}
+
 export default i18n;