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/dialog/DialogScrollContent.vue

@@ -0,0 +1,59 @@
+<script setup lang="ts">
+import type { DialogContentEmits, DialogContentProps } from "reka-ui"
+import type { HTMLAttributes } from "vue"
+import { reactiveOmit } from "@vueuse/core"
+import { X } from "lucide-vue-next"
+import {
+  DialogClose,
+  DialogContent,
+  DialogOverlay,
+  DialogPortal,
+  useForwardPropsEmits,
+} from "reka-ui"
+import { cn } from "@/lib/utils"
+
+defineOptions({
+  inheritAttrs: false,
+})
+
+const props = defineProps<DialogContentProps & { class?: HTMLAttributes["class"] }>()
+const emits = defineEmits<DialogContentEmits>()
+
+const delegatedProps = reactiveOmit(props, "class")
+
+const forwarded = useForwardPropsEmits(delegatedProps, emits)
+</script>
+
+<template>
+  <DialogPortal>
+    <DialogOverlay
+      class="fixed inset-0 z-50 grid place-items-center overflow-y-auto bg-black/80  data-[state=open]:animate-in data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=open]:fade-in-0"
+    >
+      <DialogContent
+        :class="
+          cn(
+            'relative z-50 grid w-full max-w-lg my-8 gap-4 border border-border bg-background p-6 shadow-lg duration-200 sm:rounded-lg md:w-full',
+            props.class,
+          )
+        "
+        v-bind="{ ...$attrs, ...forwarded }"
+        @pointer-down-outside="(event) => {
+          const originalEvent = event.detail.originalEvent;
+          const target = originalEvent.target as HTMLElement;
+          if (originalEvent.offsetX > target.clientWidth || originalEvent.offsetY > target.clientHeight) {
+            event.preventDefault();
+          }
+        }"
+      >
+        <slot />
+
+        <DialogClose
+          class="absolute top-4 right-4 p-0.5 transition-colors rounded-md hover:bg-secondary"
+        >
+          <X class="w-4 h-4" />
+          <span class="sr-only">Close</span>
+        </DialogClose>
+      </DialogContent>
+    </DialogOverlay>
+  </DialogPortal>
+</template>