feat(video-from-script): 重构工作流为子Agent分步执行并新增提示词模板系统

将视频制作工作流拆分为独立子步骤：分镜 → 图片提示词 → 生图 → 视频提示词 → 生视频 → 成片，每步由子Agent独立执行。引入prompts/目录统一管理提示词模板（分镜.md、图片提示词.md、视频提示词.md），通过account.json的storyboardPrompt/imageStylePrompt/videoStylePrompt字段引用。

变更内容：
- 新增confirmed机制和pipeline.js confirm命令，生图后必须人工确认才能继续
- manifest schema改用shotDesc/narration/duration/directorRef替代旧字段
- 文件命名规则从keyword改为slug（从shotDesc/narration派生）
- 删除旧的storyboard-rules.md和prompt-rules.md
- pipeline.js脚本拆分为lib/目录下的独立模块（cmd-init/cmd-confirm/cmd-validate/phase-*）
- 新增cmd-create-account支持一键创建带prompts目录的账号
- capcut_assemble支持narration字段替代text作为字幕源
- 新增.gitclaude/settings.json权限配置

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

@@ -0,0 +1,38 @@
+/**
+ * Command: status — 显示 manifest 执行状态
+ */
+
+const { loadManifest } = require('./pipeline-utils')
+
+const ALL_PHASES = ['images', 'upload', 'videos', 'tts', 'assemble']
+
+function showStatus(manifestPath) {
+  const manifest = loadManifest(manifestPath)
+  const phases = manifest.pipeline?.phases || {}
+
+  console.log(`\nManifest: ${manifestPath}`)
+  console.log(`Account: ${manifest.account || '(未指定)'}`)
+  console.log(`\n阶段状态:`)
+  for (const p of ALL_PHASES) {
+    const status = phases[p] || 'pending'
+    const icon = status === 'done' ? '✓' : status === 'running' ? '→' : status === 'failed' ? '✗' : status === 'partial' ? '~' : '·'
+    console.log(`  ${icon} ${p}: ${status}`)
+  }
+
+  const items = manifest.items || []
+  const done = items.filter(it => it.status === 'done').length
+  const failed = items.filter(it => it.status === 'failed').length
+  const pending = items.filter(it => !it.status || it.status === 'pending').length
+
+  console.log(`\nItems: ${items.length} 总计, ${done} 完成, ${failed} 失败, ${pending} 待处理`)
+
+  if (failed > 0) {
+    console.log(`\n失败项:`)
+    items.filter(it => it.status === 'failed').forEach((it, i) => {
+      console.log(`  [${it.id || i + 1}] ${it.error || '未知错误'}`)
+    })
+  }
+  console.log()
+}
+
+module.exports = { showStatus }