调整 api 目录，代码优化

src/api/monitor/visits.js

@@ -0,0 +1,22 @@
+import request from '@/utils/request'
+
+export function count() {
+  return request({
+    url: 'api/visits',
+    method: 'post'
+  })
+}
+
+export function get() {
+  return request({
+    url: 'api/visits',
+    method: 'get'
+  })
+}
+
+export function getChartData() {
+  return request({
+    url: 'api/visits/chartData',
+    method: 'get'
+  })
+}