fix(web): 积分商品图片预览 — 改用 React state 驱动替代 antd Form shouldUpdate

ant Form shouldUpdate + setFieldValue 在 DrawerForm 上下文中无法正确触发重渲染，
改用独立 imageUrl state 管理，Input/预览/MediaPicker/Upload 全部通过 state 同步

apps/web/src/pages/health/PointsProductList.tsx

@@ -66,7 +66,7 @@ export default function PointsProductList() {
   const [modalOpen, setModalOpen] = useState(false);
   const [editing, setEditing] = useState<PointsProduct | null>(null);
   const [mediaPickerOpen, setMediaPickerOpen] = useState(false);
-  const [form] = Form.useForm();
+  const [imageUrl, setImageUrl] = useState<string>('');
   const isDark = useThemeMode();
 
   const fetchProducts = useCallback(
@@ -103,11 +103,13 @@ export default function PointsProductList() {
   // ---- 新建 / 编辑 ----
   const openCreate = () => {
     setEditing(null);
+    setImageUrl('');
     setModalOpen(true);
   };
 
   const openEdit = (record: PointsProduct) => {
     setEditing(record);
+    setImageUrl(record.image_url || '');
     setModalOpen(true);
   };
 
@@ -124,12 +126,12 @@ export default function PointsProductList() {
         points_cost: number;
         stock: number;
         description?: string;
-        image_url?: string;
         sort_order?: number;
       };
       if (editing) {
         await pointsApi.updateProduct(editing.id, {
           ...typed,
+          image_url: imageUrl || undefined,
           version: editing.version,
         });
       } else {
@@ -139,7 +141,7 @@ export default function PointsProductList() {
           points_cost: typed.points_cost,
           stock: typed.stock,
           description: typed.description,
-          image_url: typed.image_url,
+          image_url: imageUrl || undefined,
           sort_order: typed.sort_order,
         };
         await pointsApi.createProduct(req);
@@ -318,59 +320,51 @@ export default function PointsProductList() {
       title: '展示设置',
       fields: (
         <>
-          <Form.Item name="image_url" hidden><Input /></Form.Item>
-          <Form.Item label="商品图片" shouldUpdate={(prev, cur) => prev.image_url !== cur.image_url}>
-            {({ getFieldValue, setFieldValue }) => {
-              const imageUrl: string | undefined = getFieldValue('image_url');
-              return (
-                <>
-                  <Space.Compact style={{ width: '100%' }}>
-                    <Input
-                      value={imageUrl || ''}
-                      onChange={(e) => setFieldValue('image_url', e.target.value || undefined)}
-                      placeholder="输入 URL 或从媒体库选择"
-                      style={{ flex: 1 }}
-                    />
-                    <Button icon={<PictureOutlined />} onClick={() => setMediaPickerOpen(true)}>
-                      媒体库
-                    </Button>
-                    <Upload
-                      accept="image/*"
-                      showUploadList={false}
-                      beforeUpload={async (file) => {
-                        try {
-                          const result = await uploadFile(file);
-                          setFieldValue('image_url', result.url);
-                          message.success('图片上传成功');
-                        } catch {
-                          message.error('图片上传失败');
-                        }
-                        return false;
-                      }}
-                    >
-                      <Button icon={<UploadOutlined />}>上传</Button>
-                    </Upload>
-                  </Space.Compact>
-                  {imageUrl && (
-                    <div
-                      style={{
-                        marginTop: 8,
-                        borderRadius: 8,
-                        overflow: 'hidden',
-                        border: `1px solid ${isDark ? '#1e293b' : '#e2e8f0'}`,
-                      }}
-                    >
-                      <img
-                        src={imageUrl}
-                        alt="商品图片预览"
-                        style={{ width: '100%', height: 120, objectFit: 'cover' }}
-                        onError={(e) => { (e.target as HTMLImageElement).style.display = 'none'; }}
-                      />
-                    </div>
-                  )}
-                </>
-              );
-            }}
+          <Form.Item label="商品图片">
+            <Space.Compact style={{ width: '100%' }}>
+              <Input
+                value={imageUrl}
+                onChange={(e) => setImageUrl(e.target.value)}
+                placeholder="输入 URL 或从媒体库选择"
+                style={{ flex: 1 }}
+              />
+              <Button icon={<PictureOutlined />} onClick={() => setMediaPickerOpen(true)}>
+                媒体库
+              </Button>
+              <Upload
+                accept="image/*"
+                showUploadList={false}
+                beforeUpload={async (file) => {
+                  try {
+                    const result = await uploadFile(file);
+                    setImageUrl(result.url);
+                    message.success('图片上传成功');
+                  } catch {
+                    message.error('图片上传失败');
+                  }
+                  return false;
+                }}
+              >
+                <Button icon={<UploadOutlined />}>上传</Button>
+              </Upload>
+            </Space.Compact>
+            {imageUrl && (
+              <div
+                style={{
+                  marginTop: 8,
+                  borderRadius: 8,
+                  overflow: 'hidden',
+                  border: `1px solid ${isDark ? '#1e293b' : '#e2e8f0'}`,
+                }}
+              >
+                <img
+                  src={imageUrl}
+                  alt="商品图片预览"
+                  style={{ width: '100%', height: 120, objectFit: 'cover' }}
+                  onError={(e) => { (e.target as HTMLImageElement).style.display = 'none'; }}
+                />
+              </div>
+            )}
           </Form.Item>
           <Form.Item name="sort_order" label="排序">
             <InputNumber min={0} max={9999} style={{ width: '100%' }} placeholder="0" />
@@ -454,7 +448,6 @@ export default function PointsProductList() {
               points_cost: editing.points_cost,
               stock: editing.stock,
               description: editing.description,
-              image_url: editing.image_url,
               sort_order: editing.sort_order,
             }
           : { stock: -1, sort_order: 0 }}
@@ -462,14 +455,13 @@ export default function PointsProductList() {
         width={600}
         columns={2}
         sections={formSections}
-        form={form}
       />
 
       <MediaPicker
         open={mediaPickerOpen}
         onClose={() => setMediaPickerOpen(false)}
         onSelect={(url) => {
-          form.setFieldValue('image_url', url);
+          setImageUrl(url);
           message.success('已选择图片');
         }}
       />