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/openim_live/lib/src/live_controller.dart

@@ -134,6 +134,11 @@ mixin OpenIMLive {
               ),
               onError: onError,
               onRoomDisconnected: () => onRoomDisconnected(event.data),
+              onStartCalling: onLiveConnected,
+              onClose: () {
+                _stopSound();
+                onLiveSessionClosed();
+              },
             );
           } else if (event.state == CallState.beRejected) {
             insertSignalingMessageSubject.add(event);
@@ -224,10 +229,14 @@ mixin OpenIMLive {
       onBusyLine: onBusyLine,
       onStartCalling: () {
         _stopSound();
+        onLiveConnected();
       },
       onError: onError,
       onRoomDisconnected: () => onRoomDisconnected(signal),
-      onClose: _stopSound,
+      onClose: () {
+        _stopSound();
+        onLiveSessionClosed();
+      },
     );
   }
 
@@ -255,11 +264,20 @@ mixin OpenIMLive {
         offlinePushInfo: OfflinePushInfo(),
         userID: signaling.invitation!.inviteeUserIDList!.first,
         isOnlineOnly: true);
-    final certificate = await Apis.getTokenForRTC(signaling.invitation!.roomID!, OpenIM.iMManager.userID);
+    final certificate = await getRtcCertificate(signaling.invitation!.roomID!, OpenIM.iMManager.userID);
 
     return certificate;
   }
 
+  /// 公司层可覆盖：走账号服务 `/api/rtc_token`，默认仍走官方 chat 换票。
+  Future<SignalingCertificate> getRtcCertificate(String roomID, String userID) {
+    return Apis.getTokenForRTC(roomID, userID);
+  }
+
+  void onLiveSessionClosed() {}
+
+  void onLiveConnected() {}
+
   Future<SignalingCertificate> onTapPickup(SignalingInfo signaling) async {
     _beCalledEvent = null; // ios bug
     _autoPickup = false;
@@ -272,7 +290,7 @@ mixin OpenIMLive {
         offlinePushInfo: OfflinePushInfo(),
         userID: signaling.invitation!.inviterUserID,
         isOnlineOnly: true);
-    final certificate = await Apis.getTokenForRTC(signaling.invitation!.roomID!, OpenIM.iMManager.userID);
+    final certificate = await getRtcCertificate(signaling.invitation!.roomID!, OpenIM.iMManager.userID);
 
     return certificate;
   }