refactor: 系统权限模块重构，迁移至PostgreSQL并对齐新设计

- 切换数据库为PostgreSQL，更新依赖与配置
- 重构权限体系，使用sys_user/sys_role/sys_menu等新实体替代旧模型
- 移除旧的用户角色/权限/系统设置相关代码与实体
- 新增字典、菜单管理模块与基础CRUD接口
- 优化鉴权逻辑，基于菜单权限标识进行接口校验
- 前端同步更新API、路由与权限控制逻辑
- 删除冗余的v-permission指令与相关代码

client/src/views/login/index.vue

@@ -68,7 +68,6 @@
 import { reactive, ref, onMounted, nextTick } from 'vue'
 import { useRouter, useRoute } from 'vue-router'
 import { message } from 'ant-design-vue'
-import axios from 'axios'
 import {
   UserOutlined,
   LockOutlined,
@@ -121,36 +120,18 @@ async function handleLogin() {
   try {
     loading.value = true
 
-    const response = await axios.post('/api/auth/login', {
-      username: formState.username,
-      password: formState.password
-    })
+    await permissionStore.login(formState.username, formState.password)
 
-    const res = response.data
-
-    if (res.code === 200) {
-      const { accessToken, refreshToken, userInfo } = res.data
-
-      localStorage.setItem('access_token', accessToken)
-      localStorage.setItem('refresh_token', refreshToken)
-
-      permissionStore.setToken(accessToken)
-      permissionStore.setUserInfo(userInfo)
-      permissionStore.setPermissions(userInfo.permissions || [])
-
-      if (formState.rememberMe) {
-        localStorage.setItem('remembered_username', formState.username)
-      } else {
-        localStorage.removeItem('remembered_username')
-      }
-
-      message.success('登录成功！')
-
-      const redirect = (route.query.redirect as string) || '/'
-      router.push(redirect)
+    if (formState.rememberMe) {
+      localStorage.setItem('remembered_username', formState.username)
     } else {
-      throw new Error(res.message || '登录失败')
+      localStorage.removeItem('remembered_username')
     }
+
+    message.success('登录成功！')
+
+    const redirect = (route.query.redirect as string) || '/'
+    router.push(redirect)
   } catch (error: any) {
     console.error('登录失败:', error)
     message.error(error.message || '登录失败，请检查用户名和密码')