feat(characters): use local character catalog

src/app/external-entry/page.tsx

@@ -4,6 +4,7 @@
  * 外部应用可以通过 query 传入 Facebook 相关信息和最终目标页，例如：
  * `/external-entry?target=chat&asid=xxx&psid=yyy`
  * `/external-entry?target=chat&mode=promotion&promotion_type=voice`
+ * `/external-entry?target=chat&character=maya`
  * `/external-entry?target=tip`
  *
  * 页面不直接 `redirect()`，而是把数据交给 Client 组件先写入本地存储，
@@ -30,6 +31,7 @@ export default async function ExternalEntryPage({
       psid={pickParam(params.psid)}
       avatarUrl={pickParam(params.avatar_url)}
       target={pickParam(params.target)}
+      character={pickParam(params.character)}
       mode={pickParam(params.mode)}
       promotionType={pickParam(params.promotion_type)}
     />