feat(auth): 后台登录、角色权限与会话访问策略

管理员与客服分角色登录，权限由后端判定；前端补齐登录、人员与组织管理页面。

frontend/src/stores/counter.ts

@@ -0,0 +1,28 @@
+/*
+Copyright 2024-2026 ReplyPier
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import { ref, computed } from 'vue'
+import { defineStore } from 'pinia'
+
+export const useCounterStore = defineStore('counter', () => {
+  const count = ref(0)
+  const doubleCount = computed(() => count.value * 2)
+  function increment() {
+    count.value++
+  }
+
+  return { count, doubleCount, increment }
+})