feat: create season subdirectory when downloading season

下载合集时创建以合集标题命名的子目录：
- 前端 TaskInitData 增加 seasonTitle 字段
- 前端下载时传递合集 seasonTitle
- 后端 TaskInitOption 增加 SeasonTitle 字段
- 后端创建任务时根据 seasonTitle 创建子目录

Co-Authored-By: AI

web/src/work/view/parseModal.ts

@@ -143,6 +143,8 @@ export class ParseModalComp implements VanComponent {
                 : workRoute.videoInfoCardData.val.owner.name.trim()
             const activeVideoInfo = getActiveFormatVideo(info.info!, info.info!.accept_quality[info.formatIndex.val], this.preferredCodec.val)
             const pagesLength = workRoute.videoInfoCardData.val.pages.length
+            // 合集标题，用于创建子目录
+            const seasonTitle = workRoute.videoInfoCardMode.val == 'season' ? cardTitle.trim() : undefined
 
             return ({
                 bvid: info.page.bvid,
@@ -169,6 +171,7 @@ export class ParseModalComp implements VanComponent {
                 audio: getAudioURL(info.info!, this.preferHiResAudio.val),
                 duration: info.info!.dash.duration,
                 downloadType: this.downloadType.val,
+                seasonTitle,
                 ...activeVideoInfo
             })
         })).then(() => {