feat(video-from-script): 集成可灵图像生成器并优化审查流程

- 新增 kling-image-generator.js 作为可灵 API 图像生成模块，支持文生图和图生图
- 在 pipeline.js 中集成可灵生图，支持在 images 阶段使用 kling 模型
- 更新 SKILL.md 文档：简化用户审查流程，支持"自行选图"模式
- 实现模型降级链（gemini → kling → mj → gemini），增强生图容错性
- 扩展 `--image-model` 参数支持，允许在重试时切换模型

.claude/skills/video-from-script/SKILL.md

@@ -133,9 +133,16 @@ Step 2: Prompt 生成 + Manifest 初始化（分镜 + 风格 → 英文 prompts
   - 首尾帧模式额外要求：每个 item 必须有 `lastFramePrompt`（`imagePrompt` 作为第一帧，不需要单独的 `firstFramePrompt`）
   - init 返回 manifest 路径，后续命令使用该路径
 
-Step 3: 生图 → 人工审查
-  跑 images 阶段。完成后审查：分辨率≥1024、风格一致性、构图、无水印。
-  不合格则删除/调 prompt 重跑，不进入下一步。
+Step 3: 生图 → 审查
+  跑 images 阶段。完成后：
+  - 用户指定"自行选图"→ Agent 自动检查数量对上文案数量就通过继续
+  - 否则 → 暂停，等用户审查。不合格则删除/调 prompt 重跑，不进入下一步
+
+  生图模型
+  - 支持模型：gemini / mj / kling
+  - 降级链：gemini → kling → mj → gemini（循环）
+  - 触发：连续失败→ Agent 换下一个模型重跑失败项
+  - 操作：`pipeline.js run --manifest <path> --phase images --retry-failed --image-model <新模型>`
 
 Step 4: 上传 + 生视频（可选，图文成片跳过此步）
   跑 upload + videos 阶段。首尾帧模式检查过渡连贯性。

.claude/skills/video-from-script/scripts/kling-image-generator.js

@@ -0,0 +1,210 @@
+#!/usr/bin/env node
+
+/**
+ * Kling Image Generator - 可灵文生图 / 图生图
+ *
+ * 配置来源: config.json 的 kelingApiKey + kelingSecretAccessKey + kelingApiBaseUrl
+ *
+ * 用法:
+ *   node kling-image-generator.js "a cute cat" -o ./output
+ *   node kling-image-generator.js "portrait" -r http://img.com/ref.jpg
+ */
+
+const fs = require('fs')
+const path = require('path')
+const https = require('https')
+const http = require('http')
+const crypto = require('crypto')
+
+// ============================================================================
+// 配置
+// ============================================================================
+
+const configPath = path.join(__dirname, '..', '..', 'config.json')
+const cfg = fs.existsSync(configPath) ? JSON.parse(fs.readFileSync(configPath, 'utf-8')) : {}
+
+const Config = {
+  apiBase: (cfg.kelingApiBaseUrl || 'https://api-beijing.klingai.com').replace(/\/+$/, ''),
+  ak: (cfg.kelingApiKey || '').trim(),
+  sk: (cfg.kelingSecretAccessKey || '').trim(),
+  model: cfg.kelingImageModel || 'kling-v2-1',
+  pollInterval: 5000,
+  maxPollTime: 300000,
+}
+
+// ============================================================================
+// JWT 鉴权
+// ============================================================================
+
+function base64url(buf) {
+  return Buffer.from(buf).toString('base64')
+    .replace(/=/g, '').replace(/\+/g, '-').replace(/\//g, '_')
+}
+
+function getToken() {
+  if (!Config.ak || !Config.sk) throw new Error('未配置可灵 API 凭证（config.json 需要 kelingApiKey + kelingSecretAccessKey）')
+  const header = base64url(JSON.stringify({ alg: 'HS256', typ: 'JWT' }))
+  const now = Math.floor(Date.now() / 1000)
+  const payload = base64url(JSON.stringify({ iss: Config.ak, exp: now + 1800, nbf: now - 5 }))
+  const sig = base64url(crypto.createHmac('sha256', Config.sk).update(`${header}.${payload}`).digest())
+  return `${header}.${payload}.${sig}`
+}
+
+// ============================================================================
+// 图片下载
+// ============================================================================
+
+async function download(url, outputPath) {
+  const protocol = url.startsWith('https') ? https : http
+  return new Promise((resolve, reject) => {
+    const file = fs.createWriteStream(outputPath)
+    protocol.get(url, (res) => {
+      if (res.statusCode >= 300 && res.statusCode < 400 && res.headers.location) {
+        file.close()
+        fs.unlinkSync(outputPath)
+        return download(res.headers.location, outputPath).then(resolve).catch(reject)
+      }
+      res.pipe(file)
+      file.on('finish', () => { file.close(); resolve(outputPath) })
+    }).on('error', (err) => {
+      file.close()
+      if (fs.existsSync(outputPath)) fs.unlinkSync(outputPath)
+      reject(err)
+    })
+  })
+}
+
+// ============================================================================
+// 可灵图片 API
+// ============================================================================
+
+const KlingImageApi = {
+  async submit(prompt, options = {}) {
+    const { referenceImageUrl = '', aspectRatio = '' } = options
+    const token = getToken()
+
+    const body = { model_name: Config.model, prompt, n: 1 }
+    if (referenceImageUrl) body.image = referenceImageUrl
+    if (aspectRatio) body.aspect_ratio = aspectRatio
+
+    console.log(`\n📡 提交可灵图片任务`)
+    console.log(`   模型: ${Config.model}`)
+    console.log(`   提示词: ${prompt.substring(0, 80)}...`)
+    if (referenceImageUrl) console.log(`   参考图: ${referenceImageUrl.substring(0, 60)}...`)
+
+    const res = await fetch(`${Config.apiBase}/v1/images/generations`, {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json', 'Authorization': `Bearer ${token}` },
+      body: JSON.stringify(body),
+    })
+
+    const json = await res.json()
+    if (json.code !== undefined && json.code !== 0 && json.code !== 200) {
+      throw new Error(`可灵图片 API 错误 (code=${json.code}): ${json.message || JSON.stringify(json)}`)
+    }
+
+    const taskId = (json.data || {}).task_id
+    if (!taskId) throw new Error(`可灵图片提交失败: ${JSON.stringify(json)}`)
+
+    console.log(`   任务 ID: ${taskId}`)
+    return taskId
+  },
+
+  async poll(taskId) {
+    const startTime = Date.now()
+    console.log(`\n⏳ 等待可灵生成...`)
+
+    while (Date.now() - startTime < Config.maxPollTime) {
+      const token = getToken()
+      const res = await fetch(`${Config.apiBase}/v1/images/generations/${taskId}`, {
+        headers: { 'Authorization': `Bearer ${token}` },
+      })
+
+      const json = await res.json()
+      const data = json.data || {}
+      const status = data.task_status
+
+      if (status === 'succeed') {
+        const images = data.task_result?.images || []
+        if (images.length > 0) {
+          console.log(`\n✅ 可灵图片生成完成!`)
+          return { success: true, imageUrl: images[0].url }
+        }
+        throw new Error('可灵返回成功但无图片')
+      }
+
+      if (status === 'failed') {
+        throw new Error(`可灵图片生成失败: ${data.task_status_msg || '未知原因'}`)
+      }
+
+      process.stdout.write(`   状态: ${status || 'processing'}\r`)
+      await new Promise(r => setTimeout(r, Config.pollInterval))
+    }
+
+    throw new Error(`可灵图片生成超时 (${Config.maxPollTime / 1000}s)`)
+  },
+}
+
+// ============================================================================
+// 核心流程
+// ============================================================================
+
+async function generate(prompt, options = {}) {
+  const { outputDir = './output', referenceImageUrl = '' } = options
+
+  fs.mkdirSync(outputDir, { recursive: true })
+
+  const taskId = await KlingImageApi.submit(prompt, { referenceImageUrl })
+  const result = await KlingImageApi.poll(taskId)
+
+  const timestamp = new Date().toISOString().replace(/[:.]/g, '-')
+  const filePath = path.join(outputDir, `${timestamp}_kling.png`)
+  await download(result.imageUrl, filePath)
+  console.log(`   下载完成: ${filePath}`)
+
+  return { success: true, taskId, imageUrl: result.imageUrl, savedFiles: [filePath] }
+}
+
+// ============================================================================
+// CLI
+// ============================================================================
+
+async function main() {
+  const args = process.argv.slice(2)
+  if (args.includes('-h') || args.includes('--help') || args.length === 0) {
+    console.log(`
+用法: node kling-image-generator.js <prompt> [options]
+
+选项:
+  -o, --output <dir>  输出目录 (默认: ./output)
+  -r, --ref <url>     参考图 URL
+  -h, --help          帮助
+`)
+    return
+  }
+
+  const options = { outputDir: './output', referenceImageUrl: '' }
+  const params = []
+
+  let i = 0
+  while (i < args.length) {
+    const arg = args[i]
+    if (arg === '-o' || arg === '--output') { options.outputDir = args[++i] }
+    else if (arg === '-r' || arg === '--ref') { options.referenceImageUrl = args[++i] }
+    else { params.push(arg) }
+    i++
+  }
+
+  const prompt = params.join(' ')
+  if (!prompt) { console.error('请提供提示词'); process.exit(1) }
+  await generate(prompt, options)
+}
+
+module.exports = { generate, KlingImageApi }
+
+if (require.main === module) {
+  main().catch(err => {
+    console.error(`\n❌ 错误: ${err.message}`)
+    process.exit(1)
+  })
+}

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

@@ -156,7 +156,7 @@ async function phaseImages(manifest, manifestPath, options) {
   if (items.length === 0) { log('images', '无待处理 item，跳过'); return }
 
   const accountConfig = options.accountConfig || {}
-  let model = manifest.imageModel || accountConfig.imageModel || 'gemini'
+  let model = options.imageModel || manifest.imageModel || accountConfig.imageModel || 'gemini'
   const ratio = manifest.format || accountConfig.defaultFormat || '9:16'
 
   // 首尾帧模式：MJ 降级为 Gemini（MJ 出4张候选图无法一一对应首尾帧）
@@ -217,8 +217,22 @@ async function phaseImages(manifest, manifestPath, options) {
           item.file = item.candidates[0]
           log('images', `[${idx}/${items.length}] ${result.files.length} 张候选，默认选第1张`)
         }
+      } else if (model === 'kling') {
+        const { generate: klingGen } = require('./kling-image-generator')
+        const klingOpts = { outputDir: imagesDir, aspectRatio: ratio }
+        if (refs.urls.length > 0) {
+          klingOpts.referenceImageUrl = refs.urls[0]
+        }
+        log('images', `[${idx}/${items.length}] 可灵生图: ${item.imagePrompt.substring(0, 60)}...`)
+        result = await klingGen(item.imagePrompt, klingOpts)
+        if (result.savedFiles && result.savedFiles.length > 0) {
+          item.file = renameGeneratedFile(
+            path.relative(dir, result.savedFiles[0]).replace(/\\/g, '/'),
+            dir, idx, item.keyword, ''
+          )
+        }
       } else {
-        throw new Error(`不支持的模型: ${model}（支持: gemini, mj）`)
+        throw new Error(`不支持的模型: ${model}（支持: gemini, mj, kling）`)
       }
 
       if (item.file) {
@@ -254,6 +268,13 @@ async function phaseImages(manifest, manifestPath, options) {
               mjOpts.styleWeight = 200
             }
             lastResult = await mjGen(item.lastFramePrompt, mjOpts)
+          } else if (model === 'kling') {
+            const { generate: klingGen } = require('./kling-image-generator')
+            lastResult = await klingGen(item.lastFramePrompt, {
+              outputDir: imagesDir,
+              referenceImageUrl: item.url || '',
+              aspectRatio: ratio,
+            })
           }
 
           if (lastResult) {