refactor: 中间栏三层架构 — useUI 组件体系 + useModelUI Hook

- 新建 useUI/ 目录：12 个文件，10 个 Qt 控件 → antd 组件封装 + 类型 + 注册表
- 新建 useModelUI Hook：param_schema → UIFieldConfig[] 自动映射
- ModelInputForm 瘦身 ~160 行：删除 buildParamDescriptors/renderParamControl/文件状态管理
- WIDGET_MAP: Record<string, ComponentType<WidgetProps>> — 零 any，完全类型安全
- 新增控件只需两步：创建组件文件 + 在 WIDGET_MAP 加一行
- 删除旧 widgets/ 目录

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/pages/home/components/useUI/ImageInput.tsx

@@ -0,0 +1,50 @@
+// ============================================================
+// ImageInput — imageInput → Upload（单张图片）
+// 用于垫图、参考图等单图上传场景
+// ============================================================
+
+import { Upload, message } from 'antd';
+import { UploadOutlined } from '@ant-design/icons';
+import type { UploadFile } from 'antd/es/upload';
+import type { WidgetProps } from './types';
+
+/** 构建图片 accept 字符串 */
+function buildAccept(filters?: string[]): string {
+   if (!filters || filters.length === 0) return 'image/png,image/jpg,image/jpeg,image/webp';
+   return filters.map((ext) => `image/${ext}`).join(',');
+}
+
+export function ImageInput({ value, onChange, disabled, config }: WidgetProps) {
+   const fileList = (value as UploadFile[]) || [];
+   const maxSizeMb = (config.maxFileSizeMb as number) || 10;
+
+   return (
+      <Upload
+         listType="picture-card"
+         maxCount={1}
+         accept={buildAccept(config.fileFilter as string[] | undefined)}
+         fileList={fileList}
+         onChange={({ fileList: newList }) => onChange?.(newList)}
+         disabled={disabled}
+         beforeUpload={(file) => {
+            const isImage = file.type.startsWith('image/');
+            if (!isImage) {
+               message.error('只能上传图片文件');
+               return Upload.LIST_IGNORE;
+            }
+            if (file.size / 1024 / 1024 >= maxSizeMb) {
+               message.error(`图片大小不能超过 ${maxSizeMb}MB`);
+               return Upload.LIST_IGNORE;
+            }
+            return false;
+         }}
+      >
+         {fileList.length < 1 && (
+            <div>
+               <UploadOutlined />
+               <div style={{ marginTop: 4, fontSize: 12 }}>上传</div>
+            </div>
+         )}
+      </Upload>
+   );
+}