fix(admin): clarify insufficient watch duration label

src/app/(main)/ad-revenue-report/page.tsx

@@ -76,7 +76,7 @@ const REWARD_STATUS_HINT: Record<string, string> = {
 
 const PLAYBACK_STATUS_TAG: Record<string, { color: string; label: string }> = {
   completed: { color: 'green', label: '已完成' },
-  too_short: { color: 'gold', label: '未满10秒' },
+  too_short: { color: 'gold', label: '观看时长不足' },
   closed_early: { color: 'default', label: '提前关闭' },
   unknown: { color: 'default', label: '未知' },
 };