fix: 首帧批量生成默认限定当前剧集

src/features/production/useProduction.ts

@@ -83,9 +83,14 @@ export function useProduction() {
         const input = { concurrency: concurrency.value, force: force.value }
         const target = getProductionSession(projectId)
         target.receipt = null
+        const staleKeyframes = query.data.value?.keyframes.stalePrimaryKeyframe ?? 0
         const labels: Record<ProductionCommand, string> = {
             prompts: force.value ? '重生成项目视频提示词' : '补齐项目视频提示词',
-            keyframes: force.value ? '新增项目首帧候选' : '补齐或更新项目主首帧',
+            keyframes: force.value
+                ? '新增项目首帧候选'
+                : staleKeyframes > 0
+                  ? `更新 ${staleKeyframes} 个过期主首帧`
+                  : `补齐第 ${episodeNo.value} 集主首帧`,
             videos: force.value ? '新增项目视频候选' : '提交就绪视频任务',
             'retry-videos': '重试失败视频任务'
         }
@@ -100,7 +105,12 @@ export function useProduction() {
                 target.receipt = {
                     kind: 'keyframes',
                     title: labels[command],
-                    result: await productionApi.generateKeyframes(projectId, { provider: 'seedream', ...input })
+                    result: await productionApi.generateKeyframes(projectId, {
+                        provider: 'seedream',
+                        ...input,
+                        // 有 stale 时由后端优先处理全部 stale；否则只补当前剧集，避免误跑整个项目。
+                        ...(force.value || staleKeyframes > 0 ? {} : { episodeNo: episodeNo.value })
+                    })
                 }
             } else if (command === 'videos') {
                 target.receipt = {