feat(mobile-next): 迁移 Android 一对一语音通话薄适配与入口

复用官方 OpenIMLive 信令与房间，换票改走账号服务 /api/rtc_token；入口仅音频，占线/超时/重复回调与销毁释放由公司层防护。

Co-authored-by: Cursor <cursoragent@cursor.com>
Co-authored-by: multica-agent <github@multica.ai>

mobile-next/lib/core/controller/app_controller.dart

@@ -59,6 +59,9 @@ class AppController extends GetxController with UpgradeManger {
 
     if (isRunningBackground && !run) {}
     isRunningBackground = run;
+    if (Get.isRegistered<IMController>()) {
+      Get.find<IMController>().backgroundSubject.add(run);
+    }
     if (!run) {
       _cancelAllNotifications();
     }