feat(live): 根据连麦状态动态显示解除连麦选项

- 新增判断是否有嘉宾在连麦的逻辑
- 仅在有嘉宾连麦时显示“解除连麦”功能
- 调整弹窗布局以适应动态内容
- 优化连麦状态变更时的用户体验

lib/widget/live/live_room_user_header.dart

@@ -87,6 +87,13 @@ class LiveRoomUserHeader extends StatelessWidget {
                   SmartDialog.showAttach(
                     targetContext: context,
                     builder: (context) {
+                      // 判断是否有嘉宾在连麦
+                      final hasGuests =
+                          roomController.rtcChannelDetail.value?.maleInfo !=
+                              null ||
+                          roomController.rtcChannelDetail.value?.femaleInfo !=
+                              null;
+
                       return Container(
                         width: 100.w,
                         margin: EdgeInsets.only(left: 160.w),
@@ -97,31 +104,38 @@ class LiveRoomUserHeader extends StatelessWidget {
                         child: Column(
                           children: [
                             SizedBox(height: 15.w),
-                            GestureDetector(
-                              onTap: () {
-                                // 关闭设置弹窗
-                                SmartDialog.dismiss();
-                                // 弹出解除连麦对话框
-                                SmartDialog.show(builder: (context){
-                                  return DisconnectMicDialog();
-                                });
-                              },
-                              child: Row(
-                                mainAxisAlignment: MainAxisAlignment.center,
-                                children: [
-                                  Image.asset(Assets.imagesMicOff, width: 15.w),
-                                  SizedBox(width: 5.w),
-                                  Text(
-                                    '解除连麦',
-                                    style: TextStyle(
-                                      color: Colors.white,
-                                      fontSize: 13.sp,
+                            // 只有当有嘉宾在连麦时才显示"解除连麦"选项
+                            if (hasGuests)
+                              GestureDetector(
+                                onTap: () {
+                                  // 关闭设置弹窗
+                                  SmartDialog.dismiss();
+                                  // 弹出解除连麦对话框
+                                  SmartDialog.show(
+                                    builder: (context) {
+                                      return DisconnectMicDialog();
+                                    },
+                                  );
+                                },
+                                child: Row(
+                                  mainAxisAlignment: MainAxisAlignment.center,
+                                  children: [
+                                    Image.asset(
+                                      Assets.imagesMicOff,
+                                      width: 15.w,
                                     ),
-                                  ),
-                                ],
+                                    SizedBox(width: 5.w),
+                                    Text(
+                                      '解除连麦',
+                                      style: TextStyle(
+                                        color: Colors.white,
+                                        fontSize: 13.sp,
+                                      ),
+                                    ),
+                                  ],
+                                ),
                               ),
-                            ),
-                            SizedBox(height: 15.w),
+                            if (hasGuests) SizedBox(height: 15.w),
                             GestureDetector(
                               onTap: () async {
                                 // 关闭弹窗