feat(upload): 封面上传支持横版与前端压缩

- 新增 imageCompress 与 imagePresets，上传前按规格高质量等比压缩
- 短剧封面拆分为竖版/横版两个上传位，带建议尺寸提示
- 轮播图、创作者中心封面与分集封面接入压缩与提示

src/views/creator-center/composables/useDramaEdit.js

@@ -18,6 +18,11 @@ import {
 } from '@/api/admin/creatorCenter'
 import { dateCell } from '@/utils/format'
 import { probeVideoDuration, resumeUpload, uploadFile } from '@/utils/uploader'
+import {
+  DRAMA_COVER_PORTRAIT,
+  EPISODE_COVER,
+  compressForPreset
+} from '@/views/contentManagement/upload/imagePresets'
 import { submissionStatusMeta, submissionTypeText, submitOptions } from './useCreatorWorkspace'
 import { useCreatorAccess } from './useCreatorAccess'
 
@@ -266,7 +271,9 @@ export function useDramaEdit() {
     uploadingId.value = row ? row.id : -1
     uploadPercent.value = 0
     try {
-      const asset = await uploadFile(file, {
+      const preset = row ? EPISODE_COVER : DRAMA_COVER_PORTRAIT
+      const compressed = await compressForPreset(file, preset)
+      const asset = await uploadFile(compressed, {
         bizType: 'DRAMA_COVER',
         onProgress: (percent) => (uploadPercent.value = percent)
       })