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/pages/chat/chat_logic.dart

@@ -22,6 +22,7 @@ import 'package:wechat_assets_picker/wechat_assets_picker.dart';
 import 'package:wechat_camera_picker/wechat_camera_picker.dart';
 import 'package:openim_live/openim_live.dart';
 
+import '../../company/feature_flags.dart';
 import '../../core/controller/app_controller.dart';
 import '../../core/controller/im_controller.dart';
 import '../../core/im_callback.dart';
@@ -1622,18 +1623,17 @@ class ChatLogic extends SuperController {
   }
 
   void call() {
+    if (!FeatureFlags.livekitCall || !isSingleChat) return;
     if (rtcIsBusy) {
       IMViews.showToast(StrRes.callingBusy);
       return;
     }
 
-    IMViews.openIMCallSheet(nickname.value, (index) {
-      imLogic.call(
-        callObj: CallObj.single,
-        callType: index == 0 ? CallType.audio : CallType.video,
-        inviteeUserIDList: [if (isSingleChat) userID!],
-      );
-    });
+    imLogic.call(
+      callObj: CallObj.single,
+      callType: CallType.audio,
+      inviteeUserIDList: [userID!],
+    );
   }
 
   void onScrollToTop() {