feat: 将工作流与 FAQ 上传上限扩至 20MB

- 同步管理端、用户中心与后端工作流文件校验

- 扩展 FAQ 普通及分享上传限制并补充边界测试

easyflow-ui-admin/app/src/views/ai/workflow/components/__tests__/workflowFileValue.test.ts

@@ -127,11 +127,21 @@ describe('workflowFileValue', () => {
   });
 
   it('上传前校验单文件大小限制', () => {
-    const oversizedFile = new File([new Uint8Array(6 * 1024 * 1024)], 'large.pdf');
+    const acceptedFile = new File(
+      [new Uint8Array(20 * 1024 * 1024)],
+      'accepted.pdf',
+    );
+    const oversizedFile = new File(
+      [new Uint8Array(20 * 1024 * 1024 + 1)],
+      'large.pdf',
+    );
 
     expect(() =>
-      validateWorkflowFileSelection([], [oversizedFile]),
-    ).toThrow('单个文件不能超过 5.0 MB');
+      validateWorkflowFileSelection([], [acceptedFile]),
+    ).not.toThrow();
+    expect(() => validateWorkflowFileSelection([], [oversizedFile])).toThrow(
+      '单个文件不能超过 20.0 MB',
+    );
   });
 
   it('上传前校验总大小限制', () => {

easyflow-ui-admin/app/src/views/ai/workflow/components/workflowFileValue.ts

@@ -21,7 +21,7 @@ export interface WorkflowResourceLike {
 
 export const WORKFLOW_FILE_LIMITS = {
   maxCount: 10,
-  maxSingleSize: 5 * 1024 * 1024,
+  maxSingleSize: 20 * 1024 * 1024,
   maxTotalSize: 50 * 1024 * 1024,
 } as const;