feat: 交互式对话框生成器 + 电商取消生成与上传优化

新增:
- 交互式对话框生成器模块（路由、页面、样式、MorePage入口）
- 电商模块取消生成功能（任务追踪/取消按钮/中止逻辑）
- 视频服务图片上传支持 Blob/dataURL/远程URL 多种来源

优化:
- 电商图片上传修复本地 blob 预览图缺少原始文件的问题
- 视频规划管线错误信息改进
- 生成流程中多处增加中止检查点

src/features/more/MorePage.tsx

@@ -7,6 +7,7 @@ import {
   DeleteOutlined,
   EditOutlined,
   HighlightOutlined,
+  MessageOutlined,
   SwapOutlined,
   ThunderboltOutlined,
   VideoCameraOutlined,
@@ -42,6 +43,7 @@ const tools: MoreTool[] = [
   { id: "camera", title: "镜头实验室", text: "角度、焦段和机位控制", icon: <CameraOutlined />, category: "image", imageTool: "camera", ready: true },
   { id: "upscale", title: "分辨率提升", text: "图片与视频高清超分", icon: <ColumnWidthOutlined />, category: "image", target: "resolutionUpscale", ready: true },
   { id: "watermarkRemoval", title: "去水印", text: "AI 智能去除图片水印和文字", icon: <DeleteOutlined />, category: "image", target: "watermarkRemoval", ready: true },
+  { id: "dialogGenerator", title: "交互式对话框生成器", text: "上传背景图，添加可拖拽编辑的对话框", icon: <MessageOutlined />, category: "image", target: "dialogGenerator", ready: true },
   { id: "subtitleRemoval", title: "字幕去除", text: "AI 智能擦除视频字幕", icon: <DeleteOutlined />, category: "video", target: "subtitleRemoval", ready: true },
   { id: "digitalHuman", title: "数字人", text: "参考人像与音频生成口播视频", icon: <CustomerServiceOutlined />, category: "video", target: "digitalHuman", ready: true, featured: true },
   { id: "characterMix", title: "角色迁移", text: "人物图迁移到参考视频动作", icon: <SwapOutlined />, category: "video", target: "characterMix", ready: true },