日常事务-处分管理：添加全局水印功能和印章图片替换

- 在审批任务对话框中添加了水印显示和隐藏功能
- 替换了静态印章图片为动态获取的印章base64数据
- 添加了下载处分送达书的按钮和相关处理逻辑
- 优化了印章样式布局，支持多种类型的印章展示
- 引入了html2canvas库用于将内容转为带水印的图片下载
- 添加了水印画布创建和背景图生成功能
```

package.json

@@ -5,11 +5,11 @@
   "author": "srs",
   "license": "MIT",
   "scripts": {
-    "dev": "cross-env vue-cli-service serve",
-    "build:prod": "cross-env NODE_OPTIONS=--openssl-legacy-provider vue-cli-service build",
-    "build:stage": "cross-env NODE_OPTIONS=--openssl-legacy-provider vue-cli-service build --mode staging",
-    "build": "cross-env NODE_OPTIONS=--openssl-legacy-provider vite build",
-    "preview": "cross-env NODE_OPTIONS=--openssl-legacy-provider node build/index.js --preview",
+    "dev": "vue-cli-service serve",
+    "build:prod": "vue-cli-service build",
+    "build:stage": "vue-cli-service build --mode staging",
+    "build": "vite build",
+    "preview": "node build/index.js --preview",
     "lint": "eslint --ext .js,.vue src",
     "lint:fix": "eslint --ext .js,.vue src --fix"
   },