fix(server): 赛事包导出传入项目名，修复 GET /api/export/project.zip 恒 500

web/src/admin/components/system/UsersPanel.vue

@@ -4,7 +4,7 @@ import { formatDateTime } from '@/shared'
 import MxIcon from '../MxIcon.vue'
 import ConfirmDialog from '../ConfirmDialog.vue'
 import MockBadge from './MockBadge.vue'
-import { USER_ROLES, usersApi, type AdminUser, type AdminUserInput } from './systemApi'
+import { describeError, USER_ROLES, usersApi, type AdminUser, type AdminUserInput } from './systemApi'
 import { useAuthStore } from '../../stores/auth'
 import { useToastStore } from '../../stores/toast'
 
@@ -46,7 +46,7 @@ async function load(): Promise<void> {
     rows.value = result.data
     usingMock.value = result.mock
   } catch (caught) {
-    loadError.value = caught instanceof Error ? caught.message : '加载用户列表失败'
+    loadError.value = describeError(caught)
   } finally {
     loading.value = false
   }
@@ -115,7 +115,7 @@ async function commitSave(): Promise<void> {
     editorOpen.value = false
     await load()
   } catch (caught) {
-    formError.value = caught instanceof Error ? caught.message : '保存失败'
+    formError.value = describeError(caught)
   } finally {
     saving.value = false
   }
@@ -133,7 +133,7 @@ async function resetPassword(): Promise<void> {
     revealed.value = { username: target.username, password: result.data.password }
     await load()
   } catch (caught) {
-    toast.error('重置密码失败', caught instanceof Error ? caught.message : null)
+    toast.error('重置密码失败', describeError(caught))
   } finally {
     resetting.value = false
   }
@@ -269,7 +269,7 @@ onMounted(() => {
               placeholder="至少 8 位，首次登录强制修改"
             />
           </div>
-          <div class="field switch-field">
+          <div v-if="editingId !== null" class="field switch-field">
             <span class="mx-label">启用</span>
             <span class="switch-row">
               <label class="mx-switch">
@@ -281,6 +281,9 @@ onMounted(() => {
           </div>
         </div>
 
+        <p class="notice">
+          角色只有「管理员 / 录入员」两种；未登录访客的只读身份由系统默认提供，不需要建账号。
+        </p>
         <p v-if="formError !== null" class="notice error">{{ formError }}</p>
 
         <div class="editor-foot">