perf(admin): 实现切页即时导航与列表 loading 壳

非阻塞 session 刷新、侧边栏 chunk 预取、KeepAlive 对齐，以及按 tab 延迟加载重型列表页。

apps/admin/src/views/Cashback.vue

@@ -129,8 +129,8 @@ function tableSummary(param: {
   });
 }
 
-async function loadHistory() {
-  historyLoading.value = true;
+async function loadHistory(opts?: { silent?: boolean }) {
+  if (!opts?.silent) historyLoading.value = true;
   try {
     const { data } = await api.get('/admin/cashbacks', {
       params: {
@@ -144,7 +144,7 @@ async function loadHistory() {
   } catch (err) {
     ElMessage.error(resolveApiError(err, t, 'msg.load_failed'));
   } finally {
-    historyLoading.value = false;
+    if (!opts?.silent) historyLoading.value = false;
   }
 }
 
@@ -250,9 +250,10 @@ function onHistoryStatusChange() {
   loadHistory();
 }
 
-onMounted(loadHistory);
-// KeepAlive 激活时静默刷新
-onActivated(() => { if (history.value.length > 0) void loadHistory(); });
+onMounted(() => void loadHistory());
+onActivated(() => {
+  if (history.value.length > 0) void loadHistory({ silent: true });
+});
 </script>
 
 <template>