refactor: 移除用户存储及相关演示用户逻辑

app/stores/user.ts

@@ -1,26 +0,0 @@
-import { computed, ref } from 'vue'
-import { defineStore } from 'pinia'
-
-export const useUserStore = defineStore('user', () => {
-  const id = ref('')
-  const displayName = ref('')
-  const role = ref('')
-  const locale = ref('zh-CN')
-
-  const isLoggedIn = computed(() => Boolean(id.value))
-
-  function loadDemoUser() {
-    id.value = 'demo-user'
-    displayName.value = 'Arctic Demo User'
-    role.value = 'Viewer'
-  }
-
-  return {
-    id,
-    displayName,
-    role,
-    locale,
-    isLoggedIn,
-    loadDemoUser,
-  }
-})