优化backend报销管理模块

backend/package.json

@@ -17,9 +17,12 @@
     "docx-preview": "^0.3.7",
     "echarts": "^6.0.0",
     "element-plus": "^2.11.7",
+    "html2canvas": "^1.4.1",
+    "jspdf": "^4.2.1",
     "less": "^4.4.2",
     "marked": "^16.4.1",
     "os": "^0.1.2",
+    "pdfjs-dist": "^6.2.108",
     "pinia": "^3.0.3",
     "v-viewer": "^3.0.11",
     "vue": "^3.5.22",