feat: 实现多站点数据隔离和管理功能

- 新增站点管理功能，替换原有的域名管理
- 添加数据库迁移工具，为现有表增加 site_id 字段
- 创建 useSite 组合式 API 统一管理站点状态
- 修改前后端 API 以支持站点筛选参数
- 更新管理界面，将域名筛选改为站点筛选
- 优化数据导出功能，支持按站点筛选导出
- 更新文档，调整站点 ID 默认值为空字符串
- 升级 wrangler 依赖至最新版本

cwd-admin/src/views/AnalyticsVisitView/index.vue

@@ -224,6 +224,7 @@ import {
   fetchLikeStats,
   type LikeStatsItem,
 } from "../../api/admin";
+import { useSite } from "../../composables/useSite";
 
 const loading = ref(false);
 const listLoading = ref(false);
@@ -240,6 +241,8 @@ const overview = ref<VisitOverviewResponse>({
   last30Days: [],
 });
 
+const { currentSiteId } = useSite();
+
 function calculateChange(current: number, previous: number) {
   if (previous === 0) {
     return current > 0 ? 100 : 0;
@@ -271,8 +274,6 @@ const visitTab = ref<"pv" | "latest">("pv");
 const visitTabStorageKey = "cwd-analytics-visit-tab";
 const chartRangeStorageKey = "cwd-analytics-visit-chart-range";
 
-const injectedDomainFilter = inject<Ref<string> | null>("domainFilter", null);
-const domainFilter = injectedDomainFilter ?? ref("");
 const last30Days = ref<{ date: string; total: number }[]>([]);
 const likeStatsItems = ref<LikeStatsItem[]>([]);
 const chartRange = ref<"7" | "30">("7");
@@ -424,7 +425,7 @@ async function loadData() {
   listLoading.value = true;
   error.value = "";
   try {
-    const domain = domainFilter.value || undefined;
+    const domain = currentSiteId.value;
     const order = getVisitOrderParam();
     const [overviewRes, pagesRes, likeStatsRes] = await Promise.all([
       fetchVisitOverview(domain),
@@ -589,7 +590,7 @@ onBeforeUnmount(() => {
   }
 });
 
-watch(domainFilter, () => {
+watch(currentSiteId, () => {
   loadData();
 });
 </script>