Update package dependencies and types for improved compatibility and functionality

This commit updates the package-lock.json and package.json files to reflect the latest versions of dependencies, including @types/node and validator. Additionally, it removes unused type definitions and enhances the overall structure of the project, ensuring better compatibility and performance across the application.

backend/package.json

@@ -8,7 +8,7 @@
     "dev": "nodemon server.js",
     "cleanup:usertoken": "node ./scripts/cleanupUserTokenKeys.js",
     "cleanup:indexes": "node ./scripts/cleanupAllIndexes.js",
-    "test": "cross-env NODE_ENV=test vitest run --runInBand"
+    "test": "cross-env NODE_ENV=test vitest run --threads false"
   },
   "keywords": [],
   "author": "",
@@ -27,19 +27,19 @@
     "jsonwebtoken": "^9.0.2",
     "multer": "^1.4.5-lts.1",
     "mysql2": "^3.10.3",
-    "pdfjs-dist": "^3.11.174",
     "node-cron": "^4.2.1",
     "nodemailer": "^7.0.9",
     "pdf-parse": "^1.1.1",
+    "pdfjs-dist": "^5.4.394",
     "sequelize": "^6.37.3",
     "sharp": "^0.33.5"
   },
   "devDependencies": {
     "cross-env": "^7.0.3",
     "nodemon": "^3.1.4",
-    "supertest": "^7.1.1",
     "sqlite3": "^5.1.7",
-    "vitest": "^1.6.0",
+    "supertest": "^7.1.1",
+    "vitest": "^4.0.8",
     "vue-eslint-parser": "9.4.3"
   }
 }