feat: 实现前端卡密管理界面

- 卡密列表展示与分页功能

- 单个/批量创建卡密

- 卡密删除与批量删除

- 卡密导出功能 (file-saver)

- 启用/禁用状态切换

- 状态判断 (有效/已使用/已失效)

- Toast 通知系统 (vue-sonner)

- 登录页面错误提示优化

- 后端登录错误消息中文化

frontend/src/components/ui/select/SelectTrigger.vue

@@ -0,0 +1,33 @@
+<script setup lang="ts">
+import type { SelectTriggerProps } from "reka-ui"
+import type { HTMLAttributes } from "vue"
+import { reactiveOmit } from "@vueuse/core"
+import { ChevronDown } from "lucide-vue-next"
+import { SelectIcon, SelectTrigger, useForwardProps } from "reka-ui"
+import { cn } from "@/lib/utils"
+
+const props = withDefaults(
+  defineProps<SelectTriggerProps & { class?: HTMLAttributes["class"], size?: "sm" | "default" }>(),
+  { size: "default" },
+)
+
+const delegatedProps = reactiveOmit(props, "class", "size")
+const forwardedProps = useForwardProps(delegatedProps)
+</script>
+
+<template>
+  <SelectTrigger
+    data-slot="select-trigger"
+    :data-size="size"
+    v-bind="forwardedProps"
+    :class="cn(
+      'border-input data-[placeholder]:text-muted-foreground [&_svg:not([class*=\'text-\'])]:text-muted-foreground focus-visible:border-ring focus-visible:ring-ring/50 aria-invalid:ring-destructive/20 dark:aria-invalid:ring-destructive/40 aria-invalid:border-destructive dark:bg-input/30 dark:hover:bg-input/50 flex w-fit items-center justify-between gap-2 rounded-md border bg-transparent px-3 py-2 text-sm whitespace-nowrap shadow-xs transition-[color,box-shadow] outline-none focus-visible:ring-[3px] disabled:cursor-not-allowed disabled:opacity-50 data-[size=default]:h-9 data-[size=sm]:h-8 *:data-[slot=select-value]:line-clamp-1 *:data-[slot=select-value]:flex *:data-[slot=select-value]:items-center *:data-[slot=select-value]:gap-2 [&_svg]:pointer-events-none [&_svg]:shrink-0 [&_svg:not([class*=\'size-\'])]:size-4',
+      props.class,
+    )"
+  >
+    <slot />
+    <SelectIcon as-child>
+      <ChevronDown class="size-4 opacity-50" />
+    </SelectIcon>
+  </SelectTrigger>
+</template>