refactor(web): migrate to TypeScript + standard Vue3 structure

memora-web/src/services/api/stats.ts

@@ -0,0 +1,7 @@
+import { http } from '../http'
+import type { Stats } from './types'
+
+export async function getStatistics() {
+  const res = await http.get<{ data: Stats }>('/stats')
+  return res.data
+}