fix(web): suppress duplicate toasts when auth session expires

Mark 401/refresh-failure errors as handled so per-view catch blocks fall
through silently while a single global "登录已过期" warning is shown.
Centralize ops-web error rendering via showOpsError.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/ops-web/src/views/SiteDomainMappingsView.vue

@@ -143,7 +143,8 @@ import { message } from 'ant-design-vue'
 import dayjs from 'dayjs'
 import { computed, onMounted, reactive, ref } from 'vue'
 
-import { OpsApiError, http } from '@/lib/http'
+import { showOpsError } from '@/lib/errors'
+import { http } from '@/lib/http'
 
 interface SiteDomainMappingRow {
   id: number
@@ -342,9 +343,7 @@ function formatDate(value: string | null | undefined): string {
 }
 
 function handleError(error: unknown) {
-  if (error instanceof OpsApiError) {
-    message.error(error.detail || error.message)
-  }
+  showOpsError(error)
 }
 
 onMounted(() => {