feat(skills): 集成 GPT Image 图片生成和编辑能力

- 新增 gpt-image-generator.js 脚本，支持文生图、图生图/重绘、批量生成
- 更新 pipeline 和 phase-images 支持 GPT Image 模型
- 更新技能文档，添加 GPT Image 使用说明和 API 特点
- 新增配置文件中的 GPT Image API 参数

.claude/skills/video-from-script/scripts/lib/cmd-validate.js

@@ -24,7 +24,7 @@ function validateManifest(manifestPath) {
   }
 
   if (!manifest.account) issues.push('缺少顶层 account')
-  if (!manifest.imageModel) issues.push('缺少顶层 imageModel（可选: gemini, mj）')
+  if (!manifest.imageModel) issues.push('缺少顶层 imageModel（可选: gemini, gpt-image, mj）')
   if (!manifest.format) issues.push('缺少顶层 format（如 9:16）')
   if (!manifest.items || !Array.isArray(manifest.items)) issues.push('缺少顶层 items 数组')
   if (!manifest.mode) issues.push('缺少顶层 mode（single 或 framePair）')

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

@@ -1,7 +1,7 @@
 /**
  * Phase: images — 图片生成
  *
- * 支持 Gemini / MJ / Kling 三种模型，含首尾帧模式
+ * 支持 Gemini / GPT Image / MJ / Kling 四种模型，含首尾帧模式
  * 并发生成，支持 task ID 恢复（MJ）
  */
 
@@ -130,6 +130,32 @@ async function generateMJ(item, idx, dir, imagesDir, ratio, refs, manifestPath,
   return harvestMJ(item, idx, dir, imagesDir, ratio, refs, manifestPath, manifest)
 }
 
+async function generateGptImage(item, idx, dir, imagesDir, ratio, refs) {
+  const { generate: gptGen, edit: gptEdit, ratioToSize } = require('../gpt-image-generator')
+  const size = ratioToSize(ratio)
+  let result
+  if (refs.localPaths.length > 0) {
+    log('images', `[${idx}] GPT Image 图生图: ${item.imagePrompt.substring(0, 60)}...`)
+    result = await gptEdit(item.imagePrompt, refs.localPaths, {
+      outputDir: imagesDir,
+      size,
+    })
+  } else {
+    log('images', `[${idx}] GPT Image 文生图: ${item.imagePrompt.substring(0, 60)}...`)
+    result = await gptGen(item.imagePrompt, {
+      outputDir: imagesDir, size,
+      quality: 'auto',
+    })
+  }
+  const file = (result.savedFiles && result.savedFiles.length > 0)
+    ? renameGeneratedFile(
+        path.relative(dir, result.savedFiles[0]).replace(/\\/g, '/'),
+        dir, idx, item.script || item.shotDesc, ''
+      )
+    : null
+  return { file }
+}
+
 async function generateKling(item, idx, dir, imagesDir, ratio, refs) {
   const { generate: klingGen } = require('../kling-image-generator')
   const klingOpts = { outputDir: imagesDir, aspectRatio: ratio }
@@ -158,6 +184,12 @@ async function generateLastFrame(item, idx, manifest, dir, imagesDir, model, rat
         outputDir: imagesDir,
         aspectRatio: ratio,
       })
+    } else if (model === 'gpt-image') {
+      const { edit: gptEdit, ratioToSize } = require('../gpt-image-generator')
+      lastResult = await gptEdit(item.lastFramePrompt, [firstFramePath], {
+        outputDir: imagesDir,
+        size: ratioToSize(ratio),
+      })
     } else if (model === 'kling') {
       const { generate: klingGen } = require('../kling-image-generator')
       lastResult = await klingGen(item.lastFramePrompt, {
@@ -273,10 +305,12 @@ async function processItem(item, manifest, manifestPath, dir, imagesDir, model,
     let result
     if (model === 'gemini') {
       result = await generateGemini(item, idx, dir, imagesDir, ratio, refs)
+    } else if (model === 'gpt-image') {
+      result = await generateGptImage(item, idx, dir, imagesDir, ratio, refs)
     } else if (model === 'kling') {
       result = await generateKling(item, idx, dir, imagesDir, ratio, refs)
     } else {
-      throw new Error(`不支持的模型: ${model}（支持: gemini, mj, kling）`)
+      throw new Error(`不支持的模型: ${model}（支持: gemini, gpt-image, mj, kling）`)
     }
 
     if (result.file) {