feat(MCN工作台): 移植dsh导入账号功能 + 弹窗按钮/宽度优化 + 分镜技能归入subskill

- 账号列表页新增「导入账号」：两种方式（抖音账号信息/本地文件夹），复用 executeTask 任务链路提交 AI 任务
- 查看改写弹窗：展开源脚本按钮移入 AI脚本 标题右侧（间隔10px），弹窗最大宽度 1400→1600
- 短视频提示词生成 整体移入 短视频脚本创作/V1.0/subskill/mcn-video-prompt（与 mcn-dou-analysis 同构，138 文件 R100 保留历史）
- 工作台 dsh-data/server 若干修复 + 记忆更新

project/短视频脚本创作/V1.0/mcn-work-shop/dsh-data.js

@@ -27,6 +27,18 @@ function getDb() {
 }
 function dbAvailable() { return getDb() !== null; }
 
+// 收藏切换：可写连接单独打开（与只读 getDb 隔离），操作完即关闭
+function setFavorite(accountId, fav) {
+  if (!fs.existsSync(DSH_DB)) throw new Error('数据库不可用');
+  const w = new DatabaseSync(DSH_DB);
+  try {
+    const r = w.prepare(`UPDATE hot_accounts SET favorite=? WHERE id=?`).run(fav ? 1 : 0, Number(accountId));
+    if (r.changes === 0) throw new Error('账号不存在');
+  } finally {
+    w.close();
+  }
+}
+
 const num = (v) => { const n = Number(v); return Number.isFinite(n) ? n : 0; };
 const fmt = (v) => (v == null || v === '') ? null : v;
 
@@ -70,7 +82,7 @@ function listAccountVideos(accountId, page = 1, pageSize = 20) {
     SELECT v.*,
       (SELECT COUNT(*) FROM account_video_source s WHERE s.video_id=v.id OR s.aweme_id=v.aweme_id) AS has_source,
       (SELECT COUNT(*) FROM account_video_analysis a WHERE a.video_id=v.id OR a.aweme_id=v.aweme_id) AS has_analysis
-    FROM account_videos v WHERE v.account_id=? ORDER BY v.id ASC LIMIT ? OFFSET ?
+    FROM account_videos v WHERE v.account_id=? ORDER BY v.publish_time IS NULL, v.publish_time DESC, v.id DESC LIMIT ? OFFSET ?
   `).all(accountId, limit, offset);
   return { account: acc, total, page: Math.max(1, Number(page) || 1), pageSize: limit, items };
 }
@@ -305,7 +317,7 @@ function getRanking({ date = '', category = '', sortBy = 'rank', order = '', pag
 }
 
 module.exports = {
-  dbAvailable, listTracks, listAccounts, listAccountVideos, getPersona, getAccountAnalysis,
+  dbAvailable, setFavorite, listTracks, listAccounts, listAccountVideos, getPersona, getAccountAnalysis,
   listVideos, getVideoDetail, getVideoScript, listRewrites, listStoryboards, listRecentScripts,
   getReviewDetail, getReviewFull, getStats, rankingMeta, getRanking, DSH_DB, RANKING_DIR,
 };