统一前端错误读取和调试日志

frontend/src/features/admin/components/HomeBannersDialog.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'
 
@@ -110,13 +111,6 @@ async function handleSave() {
   }
 }
 
-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
-}
 </script>
 
 <template>