refactor(视频播放器): 优化暂停逻辑并添加引用

在VideoPlayer组件中，将暂停逻辑从`videoRef.value?.$player`改为直接使用`player.value`，以提高代码可读性和维护性。在UploadVideoPopup组件中，添加`videoPlayerRef`引用，确保在提交和取消时暂停视频播放

@@ -30,7 +30,7 @@
         </div>
 
         <div v-if="videoUrl" class="video-preview">
-          <VideoPlayer :video-url="videoUrl" :autoplay="false" />
+          <VideoPlayer ref="videoPlayerRef" :video-url="videoUrl" :autoplay="false" />
         </div>
       </div>
     </div>
@@ -115,11 +115,14 @@ const onOversize = () => {
   showToast('文件大小不能超过100MB');
 };
 
+const videoPlayerRef = ref(null);
+
 const onSubmit = () => {
   if (!videoUrl.value || !videoId.value) {
     showToast('请先上传视频');
     return;
   }
+  videoPlayerRef.value?.pause();
   emit('submit', {
     url: videoUrl.value,
     id: videoId.value,
@@ -129,6 +132,7 @@ const onSubmit = () => {
 };
 
 const onCancel = () => {
+  videoPlayerRef.value?.pause();
   emit('cancel');
   emit('update:modelValue', false);
 };

@@ -109,8 +109,8 @@ onBeforeUnmount(() => {
 
 defineExpose({
   pause() {
-    if (videoRef.value?.$player) {
-      videoRef.value.$player.pause();
+    if (player.value) {
+      player.value.pause();
     }
   },
 });