统一前端错误读取和调试日志

frontend/src/features/admin/components/AssignPermissionsDialog.vue

@@ -1,4 +1,5 @@
 <script setup lang="ts">
+import { readError } from '@/shared/utils/error'
 import { ElMessage } from 'element-plus'
 import { ref, watch } from 'vue'
 
@@ -94,13 +95,6 @@ function isGroupPartial(perms: Permission[]) {
   return perms.some(p => selectedPermIds.value.includes(p.id)) && !isGroupAllSelected(perms)
 }
 
-function readError(error: unknown, fallback: string) {
-  if (typeof error === 'object' && error && 'response' in error) {
-    const response = (error as { response?: { data?: { message?: string } } }).response
-    return response?.data?.message || fallback
-  }
-  return fallback
-}
 
 const resourceLabels: Record<string, string> = {
   dashboard: '仪表盘',