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/package.json

@@ -0,0 +1,38 @@
+{
+  "name": "frontend",
+  "private": true,
+  "version": "0.0.0",
+  "type": "module",
+  "scripts": {
+    "dev": "vite",
+    "build": "vue-tsc -b && vite build",
+    "preview": "vite preview"
+  },
+  "dependencies": {
+    "@tailwindcss/vite": "^4.1.18",
+    "@tanstack/vue-table": "^8.21.3",
+    "@vueuse/core": "^14.1.0",
+    "axios": "^1.13.2",
+    "class-variance-authority": "^0.7.1",
+    "clsx": "^2.1.1",
+    "file-saver": "^2.0.5",
+    "lucide-vue-next": "^0.562.0",
+    "pinia": "^3.0.4",
+    "reka-ui": "^2.7.0",
+    "tailwind-merge": "^3.4.0",
+    "tailwindcss": "^4.1.18",
+    "vue": "^3.5.24",
+    "vue-router": "4",
+    "vue-sonner": "^2.0.9"
+  },
+  "devDependencies": {
+    "@types/file-saver": "^2.0.7",
+    "@types/node": "^24.10.1",
+    "@vitejs/plugin-vue": "^6.0.1",
+    "@vue/tsconfig": "^0.8.1",
+    "tw-animate-css": "^1.4.0",
+    "typescript": "~5.9.3",
+    "vite": "^7.2.4",
+    "vue-tsc": "^3.1.4"
+  }
+}