fix(web-admin): 样本接收弹窗不展示协议附件项

验收要求仅展示知情同意书与孕妇健康调查表，移除第三项「协议附件」分组。

Co-authored-by: Cursor <cursoragent@cursor.com>

web-admin/src/utils/protocol-source-attachment.test.ts

@@ -42,9 +42,10 @@ describe('protocol-source-attachment', () => {
     })
     assert.deepEqual(
       groups.map((g) => g.label),
-      ['知情同意书', '孕妇健康调查表', '协议附件']
+      ['知情同意书', '孕妇健康调查表']
     )
     assert.ok(groups.every((g) => g.files.length === 1))
+    assert.equal(groups.length, 2)
   })
 
   it('groups research donation attachments for reception dialog', () => {