feat(call): 实现通话拒绝功能和优化消息处理

- 将 _handleRtmMessage 方法改为异步方法以支持异步操作
- 添加对 reject 消息的处理逻辑，包括取消频道订阅和关闭通话界面
- 实现拒绝通话时调用RTC接口并发送拒绝消息到RTM频道
- 优化 channelId 验证逻辑，避免空值导致的错误
- 添加通话拒绝时的音频停止和会话清理功能

lib/controller/message/call_controller.dart

@@ -128,7 +128,7 @@ class CallController extends GetxController {
   }
 
   /// 处理 RTM 消息
-  void _handleRtmMessage(MessageEvent event) {
+  Future<void> _handleRtmMessage(MessageEvent event) async {
     try {
       // 解析消息内容
       String messageText;
@@ -161,9 +161,33 @@ class CallController extends GetxController {
         } else if (event == 'hangup') {
           // 收到挂断消息，执行退出逻辑
           print('📞 [CallController] 收到 hangup 消息，执行退出逻辑');
-          RTMManager.instance.unsubscribe(messageData['channelId']);
+          final channelId = messageData['channelId'] as String?;
+          if (channelId != null && channelId.isNotEmpty) {
+            RTMManager.instance.unsubscribe(channelId);
+          }
           SmartDialog.dismiss(tag: 'video_call_invite_dialog');
           _handleHangupMessage();
+        } else if (event == 'reject') {
+          // 发起方收到 reject 消息，执行退出逻辑
+          print('📞 [CallController] 收到 reject 消息，执行退出逻辑');
+          final channelId = messageData['channelId'] as String?;
+          if (channelId != null && channelId.isNotEmpty) {
+            RTMManager.instance.unsubscribe(channelId);
+            print('✅ [CallController] 已取消订阅 RTM 频道: $channelId');
+          }
+          // 关闭通话小窗口
+          if (Get.isRegistered<OverlayController>()) {
+            final overlayController = Get.find<OverlayController>();
+            overlayController.hideVideoCall();
+            print('✅ [CallController] 已关闭通话小窗口');
+          }
+          // 退出 VideoCallPage（如果当前在 VideoCallPage）
+          if (Get.currentRoute.contains('VideoCallPage')) {
+            Get.back();
+            print('✅ [CallController] 已退出 VideoCallPage');
+          }
+          // 结束通话
+          await endCall(callDuration: callDurationSeconds.value);
         }
       }
     } catch (e) {
@@ -391,12 +415,47 @@ class CallController extends GetxController {
     // 停止播放来电铃声（已拒绝）
     stopCallAudio();
 
+    // 从消息中获取 channelId
+    String? channelId;
+    if (message.body is EMCustomMessageBody) {
+      final customBody = message.body as EMCustomMessageBody;
+      final params = customBody.params;
+      if (params != null && params.containsKey('channelId')) {
+        channelId = params['channelId']?.toString();
+      }
+    }
+
+    // 如果有 channelId，调用拒绝接口
+    if (channelId != null && channelId.isNotEmpty) {
+      final response = await _networkService.rtcApi.refuseOneOnOneRtcChannel({
+        'channelId': channelId,
+      });
+      if (!response.data.isSuccess) {
+        SmartDialog.showToast(response.data.message);
+        return false;
+      }
+      print('✅ [CallController] 已调用拒绝一对一RTC频道接口，channelId: $channelId');
+      await RTMManager.instance.unsubscribe(channelId);
+      final callInfo = _parseCallInfo(message);
+      final callTypeStr = callInfo?['callType'] as String?;
+      final callType = callTypeStr == 'video' ? 'video' : 'voice';
+
+      // 发送拒绝 RTM 消息
+      await RTMManager.instance.publishChannelMessage(
+        channelName: channelId,
+        message: json.encode({
+          'type': 'call_message',
+          'uid': 0,
+          'channelId': channelId,
+          'callType': callType,
+          'event': 'reject',
+        }),
+      );
+    }
+
     // 清理通话会话
     currentCall.value = null;
 
-    // TODO: 这里可以集成实际的通话SDK，拒绝通话
-    // 例如：await RTCManager.instance.rejectCall(message.from ?? '');
-
     return true;
   }