fix(admin): 统一剧集上传格式与提示文案

Co-authored-by: Cursor <cursoragent@cursor.com>

src/locales/en.ts

@@ -537,7 +537,7 @@ export default {
     retry: 'Retry',
     retryAll: 'Retry all',
     remove: 'Remove',
-    hint: 'Supports MP4 / MOV / MKV / WEBM, max 500MB each; up to 2 files in parallel.',
+    hint: 'Supports MP4 / MOV / MKV / WEBM, max 500MB each; multi-select allowed, 2 upload in parallel, the rest queue automatically.',
     invalidType: 'Only MP4, MOV, MKV, WEBM are allowed',
     oversize: 'File exceeds 500MB and was not queued',
     overallProgress: 'Overall progress',

src/locales/zh-CN.ts

@@ -531,7 +531,7 @@ export default {
     retry: '重试',
     retryAll: '全部重试',
     remove: '移除',
-    hint: '支持 MP4 / MOV / MKV / WEBM，单文件不超过 500MB；同时最多上传 2 个文件。',
+    hint: '支持 MP4 / MOV / MKV / WEBM，单文件不超过 500MB；可一次多选，同时上传 2 个，其余自动排队。',
     invalidType: '仅支持 MP4、MOV、MKV、WEBM',
     oversize: '文件超过 500MB，未入队',
     overallProgress: '总进度',