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/services/groups.ts

@@ -0,0 +1,52 @@
+/*
+Copyright 2024-2026 ChatterMate
+
+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 type { User, UserGroup } from '@/types/user'
+import api from './api'
+
+
+
+export async function listGroups(): Promise<UserGroup[]> {
+  const response = await api.get('/groups')
+  return response.data
+}
+
+export async function createGroup(groupData: Partial<UserGroup>): Promise<UserGroup> {
+  const response = await api.post('/groups', groupData)
+  return response.data
+}
+
+export async function updateGroup(id: string, groupData: Partial<UserGroup>): Promise<UserGroup> {
+  const response = await api.put(`/groups/${id}`, groupData)
+  return response.data
+}
+
+export async function deleteGroup(id: string): Promise<void> {
+  await api.delete(`/groups/${id}`)
+}
+
+export async function addUserToGroup(groupId: string, userId: string): Promise<void> {
+  await api.post(`/groups/${groupId}/users/${userId}`)
+}
+
+export async function removeUserFromGroup(groupId: string, userId: string): Promise<void> {
+  await api.delete(`/groups/${groupId}/users/${userId}`)
+}
+
+export async function getGroupUsers(groupId: string): Promise<UserGroup> {
+  const response = await api.get(`user-groups/${groupId}`)
+  return response.data
+}