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/subskill/mcn-video-prompt/参考skills/seedance2.0-prompt-skill/LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2026 Seedance Prompt Skill Contributors
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.