fix(build): 修复打包过程中的依赖和导入错误

- 安装缺失的 sass 依赖解决预处理器报错问题
- 安装 element-plus 组件库依赖，修复相关页面构建失败
- 修正 customerLead 页面错误导入的 listUser 为 listUsers
- 确认修复后 pnpm build 成功，产物正常生成
- 更新 package.json 和 pnpm-lock.yaml，引入新依赖并锁定版本

package.json

@@ -32,6 +32,7 @@
     "echarts": "^5.3.3",
     "echarts-wordcloud": "^2.0.0",
     "ele-admin-pro": "^1.10.1",
+    "element-plus": "^2.14.3",
     "exceljs": "^4.3.0",
     "file-saver": "^2.0.5",
     "github-markdown-css": "^5.1.0",
@@ -78,6 +79,7 @@
     "prettier": "^2.7.1",
     "rimraf": "^3.0.2",
     "rollup-plugin-visualizer": "^5.9.2",
+    "sass": "^1.101.0",
     "tailwindcss": "^3.4.6",
     "terser": "^5.15.0",
     "typescript": "^4.8.2",