日期选择器改为中文语言和深色风格

frontend/src/views/Analytics.vue

@@ -11,6 +11,8 @@
               :placeholder="'选择月份'"
               format="YYYY年MM月"
               valueFormat="YYYY-MM"
+              :locale="locale"
+              :popup-class-name="'dark-date-picker'"
               @change="handleMonthChange"
               class="month-picker"
               :allowClear="true"
@@ -524,8 +526,16 @@ import { message } from 'ant-design-vue'
 import * as echarts from 'echarts'
 import Icon from '@/components/Icon.vue'
 import dayjs, { Dayjs } from 'dayjs'
+import 'dayjs/locale/zh-cn'
+import zhCN from 'ant-design-vue/es/locale/zh_CN'
 import { fetchDepartmentOverview } from '@/api/department'
 
+// 设置 dayjs 中文
+dayjs.locale('zh-cn')
+
+// Ant Design 中文配置
+const locale = zhCN
+
 const router = useRouter()
 const loading = ref(false)
 const selectedMonth = ref<string | null>(null)