feat: stores 部分接入 i18n（auth/settings/apistats/dashboard/clients：标题、错误与日期提示本地化）

web/admin-spa/src/stores/auth.js

@@ -1,6 +1,7 @@
 import { defineStore } from 'pinia'
 import { ref, computed } from 'vue'
 import router from '@/router'
+import i18n from '@/i18n'
 import { apiClient } from '@/config/api'
 
 export const useAuthStore = defineStore('auth', () => {
@@ -39,10 +40,10 @@ export const useAuthStore = defineStore('auth', () => {
 
         await router.push('/dashboard')
       } else {
-        loginError.value = result.message || '登录失败'
+        loginError.value = result.message || i18n.global.t('login.loginFailed')
       }
     } catch (error) {
-      loginError.value = error.message || '登录失败，请检查用户名和密码'
+      loginError.value = error.message || i18n.global.t('login.loginFailedCheck')
     } finally {
       loginLoading.value = false
     }
@@ -102,7 +103,7 @@ export const useAuthStore = defineStore('auth', () => {
 
         // 设置页面标题
         if (result.data.siteName) {
-          document.title = `${result.data.siteName} - 管理后台`
+          document.title = `${result.data.siteName} - ${i18n.global.t('header.adminPanel')}`
         }
       }
     } catch (error) {