feat：增强文件预览功能

- 新增视频文件预览
- 新增Pdf文件预览

upload-file-frontend/package.json

@@ -12,6 +12,7 @@
     "axios-extra": "^0.0.8",
     "core-js": "^3.8.3",
     "element-ui": "^2.15.14",
+    "pdfjs-dist": "^5.0.375",
     "promise-queue-plus": "^1.2.2",
     "spark-md5": "^3.0.2",
     "vue": "^2.6.14",
@@ -22,6 +23,9 @@
   "devDependencies": {
     "@babel/core": "^7.12.16",
     "@babel/eslint-parser": "^7.12.16",
+    "@babel/plugin-transform-class-properties": "^7.25.9",
+    "@babel/plugin-transform-private-methods": "^7.25.9",
+    "@babel/preset-env": "^7.26.9",
     "@vue/cli-plugin-babel": "~5.0.0",
     "@vue/cli-plugin-eslint": "~5.0.0",
     "@vue/cli-plugin-router": "~5.0.0",