feat(video-pipeline): 重构视频流水线，优化成片时间线规则和状态管理

- 引入 manifest.json 作为唯一状态源，所有子 Agent 操作回写 manifest
- 重构 timebuilder 逻辑，支持四种视频适配策略（加速/裁剪/放缓/画面停顿）
- 统一 TTS 阶段输出结构，单句和多句均写入 segments[]
- 重写字幕和配音生成，基于 segments 精确时长实现音画同步
- 新增 confirm 命令支持按 id 范围确认，上传阶段分离图片和视频
- 添加中间产物写入 output/ 目录的约束，清理废弃配置参数

.claude/skills/video-from-script/scripts/lib/phase-upload.js

@@ -1,7 +1,7 @@
 /**
  * Phase: upload — OSS 上传
  *
- * 将生成的图片（含首尾帧）上传到 OSS，回写 url
+ * 将图片（含首尾帧）和视频上传到 OSS，回写 url / videoUrl
  */
 
 const path = require('path')
@@ -11,35 +11,64 @@ async function phaseUpload(manifest, manifestPath) {
   const dir = getManifestDir(manifestPath)
   const { uploadFile } = require('../oss-upload')
 
-  const items = manifest.items.filter(it =>
+  // 图片（含首尾帧 first frame）
+  const imageItems = manifest.items.filter(it =>
     it.status === 'done' && it.file && !it.url
   )
-  if (items.length === 0) { log('upload', '无待上传 item，跳过'); return }
+  // 视频
+  const videoItems = manifest.items.filter(it =>
+    it.status === 'done' && it.video && !it.videoUrl
+  )
 
-  log('upload', `共 ${items.length} 个文件`)
+  if (imageItems.length === 0 && videoItems.length === 0) {
+    log('upload', '无待上传文件，跳过')
+    return
+  }
 
-  for (let i = 0; i < items.length; i++) {
-    const item = items[i]
-    const filePath = path.resolve(dir, item.file)
-    try {
-      const { url } = await uploadFile(filePath)
-      item.url = url
-      log('upload', `[${i + 1}/${items.length}] ${item.file} → ${url.substring(0, 60)}...`)
-    } catch (err) {
-      item.error = `上传失败: ${err.message}`
-      log('upload', `[${i + 1}/${items.length}] 失败: ${err.message}`)
-    }
-    if (item.url && item.lastFrame && !item.lastFrameUrl) {
-      const lastPath = path.resolve(dir, item.lastFrame)
+  // 上传图片
+  if (imageItems.length > 0) {
+    log('upload', `图片: ${imageItems.length} 个`)
+    for (let i = 0; i < imageItems.length; i++) {
+      const item = imageItems[i]
+      const filePath = path.resolve(dir, item.file)
       try {
-        const { url } = await uploadFile(lastPath)
-        item.lastFrameUrl = url
-        log('upload', `[${i + 1}/${items.length}] lastFrame → OK`)
+        const { url } = await uploadFile(filePath)
+        item.url = url
+        log('upload', `  [${i + 1}/${imageItems.length}] ${item.file} → OK`)
       } catch (err) {
-        log('upload', `[${i + 1}/${items.length}] lastFrame 上传失败: ${err.message}`)
+        item.error = `上传失败: ${err.message}`
+        log('upload', `  [${i + 1}/${imageItems.length}] 失败: ${err.message}`)
       }
+      // 首尾帧模式：上传 lastFrame
+      if (item.url && item.lastFrame && !item.lastFrameUrl) {
+        const lastPath = path.resolve(dir, item.lastFrame)
+        try {
+          const { url } = await uploadFile(lastPath)
+          item.lastFrameUrl = url
+          log('upload', `  [${i + 1}/${imageItems.length}] lastFrame → OK`)
+        } catch (err) {
+          log('upload', `  [${i + 1}/${imageItems.length}] lastFrame 上传失败: ${err.message}`)
+        }
+      }
+      saveManifest(manifestPath, manifest)
+    }
+  }
+
+  // 上传视频
+  if (videoItems.length > 0) {
+    log('upload', `视频: ${videoItems.length} 个`)
+    for (let i = 0; i < videoItems.length; i++) {
+      const item = videoItems[i]
+      const videoPath = path.resolve(dir, item.video)
+      try {
+        const { url } = await uploadFile(videoPath)
+        item.videoUrl = url
+        log('upload', `  [${i + 1}/${videoItems.length}] ${item.video} → OK`)
+      } catch (err) {
+        log('upload', `  [${i + 1}/${videoItems.length}] 失败: ${err.message}`)
+      }
+      saveManifest(manifestPath, manifest)
     }
-    saveManifest(manifestPath, manifest)
   }
 }