feat(admin): migrate admin UI to Vue3

admin-frontend/src/api/email.js

@@ -0,0 +1,27 @@
+import { api } from './client'
+
+export async function fetchEmailSettings() {
+  const { data } = await api.get('/email/settings')
+  return data
+}
+
+export async function updateEmailSettings(payload) {
+  const { data } = await api.post('/email/settings', payload)
+  return data
+}
+
+export async function fetchEmailStats() {
+  const { data } = await api.get('/email/stats')
+  return data
+}
+
+export async function fetchEmailLogs(params) {
+  const { data } = await api.get('/email/logs', { params })
+  return data
+}
+
+export async function cleanupEmailLogs(days) {
+  const { data } = await api.post('/email/logs/cleanup', { days })
+  return data
+}
+