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/ImageListInput.tsx

@@ -0,0 +1,55 @@
+// ============================================================
+// ImageListInput — imageList → Dragger（多张图片拖拽上传）
+// 用于图生图模型的多图输入场景
+// ============================================================
+
+import { Upload, message } from 'antd';
+import { InboxOutlined } from '@ant-design/icons';
+import type { UploadFile } from 'antd/es/upload';
+import type { WidgetProps } from './types';
+
+const { Dragger } = Upload;
+
+export function ImageListInput({ value, onChange, disabled, config }: WidgetProps) {
+   const fileList = (value as UploadFile[]) || [];
+   const maxSizeMb = (config.maxFileSizeMb as number) || 10;
+   const maxCount = (config.maxFiles as number) || 10;
+   const filters = config.fileFilter as string[] | undefined;
+
+   return (
+      <Dragger
+         multiple
+         listType="picture"
+         accept={
+            filters
+               ? filters.map((ext) => `image/${ext}`).join(',')
+               : 'image/png,image/jpg,image/jpeg,image/webp'
+         }
+         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;
+         }}
+         maxCount={maxCount}
+      >
+         <p className="ant-upload-drag-icon">
+            <InboxOutlined />
+         </p>
+         <p className="ant-upload-text">点击或拖拽图片到此区域上传</p>
+         <p className="ant-upload-hint">
+            支持 {filters?.join(' / ').toUpperCase() || 'PNG / JPG / WebP'}
+            ，单张不超过 {maxSizeMb}MB
+         </p>
+      </Dragger>
+   );
+}