feat(video-pipeline): 添加可配置的转场策略引擎和TTS语速支持

- 引入转场策略系统（`getTransition`），支持 `fixed`、`director`、`rhythm` 三种模式
- 根据账号配置文件动态读取转场配置（`loadTransitions`）
- 图片和视频轨道分别调用转场策略，替代原有的固定“闪白”转场
- 支持 `byPosition`（hook/body/keypoint/closing）和 `byDirector` 两种高级选择策略
- 图片动画支持 `loop_animation` 与 `in_animation` 解析（“缩放”、“弹入”等组合）
- TTS 合成新增 `rate` 字段（源自账号配置 `ttsRate`），默认语速调整为 1.1
- 默认动画类型从 `kenburns-zoom` 改为 `缩放`，适配中文 CapCut

.claude/skills/video-from-script/scripts/capcut_assemble.js

@@ -108,6 +108,44 @@ async function uploadToOSS(filePath) {
   return url
 }
 
+// ============================================================================
+// 转场选择策略
+// ============================================================================
+
+function getTransition(item, index, totalCount, transitionConfig) {
+  // 无配置 → 不加转场
+  if (!transitionConfig) return { name: '', duration: 0 }
+
+  const defaultT = transitionConfig.default || { name: '闪白', duration: 150000 }
+  const strategy = transitionConfig.strategy || 'fixed'
+
+  // 第一个素材不加转场
+  if (index === 0) return { name: '', duration: 0 }
+
+  switch (strategy) {
+    case 'director': {
+      // 按 directorRef 选择转场
+      const ref = (item.directorRef || '').toLowerCase()
+      const byDirector = transitionConfig.byDirector || {}
+      return byDirector[ref] || defaultT
+    }
+
+    case 'rhythm': {
+      // 按位置选择转场（hook / body / keypoint / closing）
+      const rules = transitionConfig.byPosition || {}
+      if (index === 1) return rules.hook || defaultT
+      if (index >= totalCount - 2) return rules.closing || defaultT
+      // 每隔3个 shot 用一个强调转场
+      if (index % 3 === 0) return rules.keypoint || defaultT
+      return rules.body || defaultT
+    }
+
+    case 'fixed':
+    default:
+      return defaultT
+  }
+}
+
 async function batchUploadToOSS(inputDir, files) {
   const urls = {}
   for (const file of files) {
@@ -179,7 +217,7 @@ async function assemble(args) {
     format = '9:16',
     apiKey = '',
     duration = '4',
-    animation = 'kenburns-zoom',
+    animation = '缩放',
     localAudio = 'true',
   } = args
 
@@ -284,7 +322,7 @@ async function assemble(args) {
   // -- 导入素材 --
   step++; console.log(`[${step}/${totalSteps}] 导入素材...`)
   if (mode === 'images') {
-    await addImages(draftUrl, items, imgUrls, timeline, width, height, animation)
+    await addImages(draftUrl, items, imgUrls, timeline, width, height, animation, transitionConfig)
   } else {
     // 视频模式：调速 → 上传 OSS → 添加到草稿
     // Step 1: ffmpeg 调速（在上传前，避免传两份）
@@ -330,7 +368,7 @@ async function assemble(args) {
         }
       }
     }
-    await addVideos(draftUrl, inputDir, items, timeline, width, height)
+    await addVideos(draftUrl, inputDir, items, timeline, width, height, transitionConfig)
   }
 
   // -- 添加 TTS 配音 --
@@ -355,6 +393,9 @@ async function assemble(args) {
     console.log(`  字幕风格: ${subtitleStyle.font || '默认'} ${subtitleStyle.inAnimation ? subtitleStyle.inAnimation + '→' + subtitleStyle.outAnimation : ''}`)
   }
 
+  // -- 读取转场策略 --
+  const transitionConfig = loadTransitions(manifest)
+
   // -- 添加字幕 --
   step++; console.log(`[${step}/${totalSteps}] 添加字幕...`)
   if (subtitles === 'true' && items.some(i => i.script || i.text)) {
@@ -418,23 +459,40 @@ async function assemble(args) {
 // 添加图片（自动上传到 OSS）
 // ============================================================================
 
-async function addImages(draftUrl, items, imgUrls, timeline, width, height, animation = '') {
+async function addImages(draftUrl, items, imgUrls, timeline, width, height, animation = '', transitionConfig = null) {
   const imageInfos = items.map((item, i) => {
     const url = imgUrls[item.file]
     if (!url) throw new Error(`图片 ${item.file} 未上传成功，无法添加`)
     const tl = timeline[i]
+    const t = getTransition(item, i, items.length, transitionConfig)
 
-    return {
+    // animation 解析：支持 "缩放" (group), "放大" (in), "渐显+缩小" (in+out)
+    const info = {
       image_url: url,
       width,
       height,
       start: tl.start,
       end: tl.end,
       duration: tl.duration,
-      animation: animation || '',
-      transition: i > 0 ? '闪白' : '',
-      transition_duration: 150000,
+      transition: t.name,
+      transition_duration: t.duration,
     }
+
+    if (animation) {
+      const parts = animation.split('+')
+      for (const part of parts) {
+        const name = part.trim()
+        // 组合动画（持续整段）：缩放、三分割 等
+        if (name === '缩放' || name === '缩放 II') {
+          info.loop_animation = name
+        } else {
+          // 默认作为入场动画
+          info.in_animation = name
+        }
+      }
+    }
+
+    return info
   })
 
   // 单次全量提交，所有图片在同一轨道
@@ -509,9 +567,10 @@ async function adjustVideoSpeed(videoPath, targetDurationSec) {
   })
 }
 
-async function addVideos(draftUrl, inputDir, items, timeline, width, height) {
+async function addVideos(draftUrl, inputDir, items, timeline, width, height, transitionConfig = null) {
   const videoInfos = items.map((item, i) => {
     const tl = timeline[i]
+    const t = getTransition(item, i, items.length, transitionConfig)
     return {
       video_url: item.videoUrl || (item.video ? path.resolve(inputDir, item.video) : null) || item.url || path.resolve(inputDir, item.file),
       width,
@@ -520,8 +579,8 @@ async function addVideos(draftUrl, inputDir, items, timeline, width, height) {
       end: tl.end,
       duration: tl.duration,
       mask: '',
-      transition: i > 0 ? '闪白' : '',
-      transition_duration: 150000,
+      transition: t.name,
+      transition_duration: t.duration,
       volume: item.volume || 1,
     }
   })
@@ -718,6 +777,18 @@ function loadSubtitleStyle(manifest) {
   } catch { return {} }
 }
 
+function loadTransitions(manifest) {
+  const account = manifest.account
+  if (!account) return null
+  const scriptDir = __dirname
+  const accountFile = path.join(scriptDir, '..', '..', '..', 'accounts', account, 'account.json')
+  if (!fs.existsSync(accountFile)) return null
+  try {
+    const accountData = JSON.parse(fs.readFileSync(accountFile, 'utf-8'))
+    return accountData.capcut?.transitions || null
+  } catch { return null }
+}
+
 // ============================================================================
 // 添加字幕（支持关键词高亮 + 账号字幕风格 + 分句切分）
 // ============================================================================