fix: FFmpeg握手失败后自动切换协议重试 + 修复表格横向滚动条

frontend/src/components/layout/MainLayout.vue

@@ -756,6 +756,7 @@ async function handleLogout() {
 .app-main {
   padding: var(--content-padding);
   min-height: 0;
+  overflow-x: hidden;
 }
 
 .backend-alert {

frontend/src/views/LiveRoomsView.vue

@@ -1247,7 +1247,8 @@ onBeforeUnmount(() => {
 }
 
 .rooms-table-shell {
-  overflow: visible;
+  overflow-x: auto;
+  overflow-y: hidden;
 }
 
 .rooms-table {

frontend/src/views/RecordTasksView.vue

@@ -940,7 +940,7 @@ onBeforeUnmount(() => {
 }
 
 .tasks-table-shell {
-  overflow: visible;
+  overflow-x: auto;
 }
 
 .sessions-card :deep(.el-card__body) {
@@ -1040,6 +1040,7 @@ onBeforeUnmount(() => {
   display: grid;
   gap: 16px;
   padding: 18px 20px 20px;
+  overflow-x: hidden;
 }
 
 .session-summary {