fix: 完善工作流图片参数流转

- 图片参数使用 Object 类型并过滤上游图片引用

- 试运行支持上传、URL 和素材库图片输入

- 将模型图片能力映射到运行配置

easyflow-ui-admin/packages/tinyflow-ui/src/utils/workflowNodeFields.test.ts

@@ -84,6 +84,7 @@ describe('workflow node fields', () => {
         key: 'file_field',
         label: '文件字段',
         type: 'file',
+        contentType: 'file',
         placeholder: '请选择文件',
       });
     expect((updated.parameters as any[]).find((item) => item.name === 'file_field'))
@@ -110,6 +111,7 @@ describe('workflow node fields', () => {
     expect(updated.startFormSchema?.find((item: any) => item.key === 'attachments'))
       .toMatchObject({
         type: 'file',
+        contentType: 'file',
         placeholder: '请选择文件',
       });
     expect((updated.parameters as any[]).find((item) => item.name === 'attachments'))
@@ -149,6 +151,99 @@ describe('workflow node fields', () => {
     expect(nextParameter?.id).toBe(previousParameter?.id);
   });
 
+  it('preserves resource content type independently from input type', () => {
+    for (const contentType of ['image', 'video', 'audio', 'other'] as const) {
+      const key = `preview_${contentType}`;
+      const initial = createInitialWorkflowData();
+      const appended = appendStartFormField(
+        initial.nodes[0]?.data as Record<string, any>,
+        {
+          key,
+          label: `资源-${contentType}`,
+          type: 'text',
+        },
+      );
+
+      const updated = updateStartFormField(appended, key, {
+        contentType,
+      });
+
+      expect(
+        updated.startFormSchema?.find((item: any) => item.key === key),
+      ).toMatchObject({
+        type: 'text',
+        contentType,
+      });
+      expect(
+        (updated.parameters as any[]).find((item) => item.name === key),
+      ).toMatchObject({
+        dataType: contentType === 'image' ? 'Object' : 'String',
+        contentType,
+        formType: 'input',
+      });
+    }
+  });
+
+  it('reconciles a legacy text schema with its image parameter', () => {
+    const initial = createInitialWorkflowData();
+    const startData = initial.nodes[0]?.data as Record<string, any>;
+    const appended = appendStartFormField(startData, {
+      key: 'legacy_image',
+      label: '图片',
+      type: 'text',
+    });
+    const imageParameterData = {
+      ...appended,
+      parameters: (appended.parameters as any[]).map((parameter) =>
+        parameter.name === 'legacy_image'
+          ? {
+              ...parameter,
+              contentType: 'image',
+              dataType: 'Object',
+            }
+          : parameter,
+      ),
+    };
+
+    const normalized = normalizeStartNodeData(imageParameterData);
+
+    expect(
+      normalized.startFormSchema?.find(
+        (field: any) => field.key === 'legacy_image',
+      ),
+    ).toMatchObject({
+      contentType: 'image',
+      type: 'text',
+    });
+    expect(
+      (normalized.parameters as any[]).find(
+        (parameter) => parameter.name === 'legacy_image',
+      ),
+    ).toMatchObject({
+      contentType: 'image',
+      dataType: 'Object',
+    });
+
+    const changedToText = updateStartFormField(normalized, 'legacy_image', {
+      contentType: 'text',
+    });
+    expect(
+      changedToText.startFormSchema?.find(
+        (field: any) => field.key === 'legacy_image',
+      ),
+    ).toMatchObject({
+      contentType: 'text',
+    });
+    expect(
+      (changedToText.parameters as any[]).find(
+        (parameter) => parameter.name === 'legacy_image',
+      ),
+    ).toMatchObject({
+      contentType: 'text',
+      dataType: 'String',
+    });
+  });
+
   it('keeps start fields unchanged when renaming to an existing key', () => {
     const initial = createInitialWorkflowData();
     const withTopic = appendStartFormField(