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/contentManagement/BannerManagementView.vue

@@ -16,6 +16,7 @@ import {
 import { pageDramasApi } from '@/api/admin/drama'
 import { useRbac } from '@/stores/rbac'
 import { uploadFile } from '@/utils/uploader'
+import { BANNER_IMAGE, compressForPreset } from '@/views/contentManagement/upload/imagePresets'
 import PageHeading from '@/views/components/PageHeading.vue'
 
 const { can } = useRbac()
@@ -218,12 +219,13 @@ async function uploadImage(options) {
   imagePercent.value = 0
   imageError.value = ''
   try {
-    const asset = await uploadFile(options.file, {
+    const file = await compressForPreset(options.file, BANNER_IMAGE)
+    const asset = await uploadFile(file, {
       bizType: 'BANNER',
       onProgress: (percent) => (imagePercent.value = percent)
     })
     form.imageUrl = asset.url
-    imageFileName.value = options.file.name
+    imageFileName.value = file.name
     await resetValidation()
     ElMessage.success('图片已上传')
   } catch {
@@ -467,7 +469,9 @@ onMounted(async () => {
                   {{ imageDisplayName }}
                 </span>
               </div>
-              <p class="banner-image-hint">支持 JPG、PNG、WebP，单张不超过 5MB。</p>
+              <p class="banner-image-hint"
+                >{{ BANNER_IMAGE.hint }}；支持 JPG、PNG、WebP，单张不超过 5MB。</p
+              >
               <el-alert
                 v-if="imageError"
                 :title="imageError"