init ana page with apis

app/api/stats/repository.ts

@@ -0,0 +1,21 @@
+import { executeQuerySingle } from '@/lib/clickhouse';
+import { StatsOverview } from '../types';
+
+/**
+ * Get overview statistics for links
+ */
+export async function findStatsOverview(): Promise<StatsOverview | null> {
+  const query = `
+    WITH 
+      toUInt64(count()) as total_links,
+      toUInt64(countIf(is_active = true)) as active_links
+    FROM links
+    SELECT
+      total_links as totalLinks,
+      active_links as activeLinks,
+      (SELECT count() FROM link_events) as totalVisits,
+      (SELECT count() FROM link_events) / NULLIF(total_links, 0) as conversionRate
+  `;
+  
+  return await executeQuerySingle<StatsOverview>(query);
+}