implemented export with pdf and excel library

backend/package.json

@@ -16,7 +16,7 @@
   "dependencies": {
     "@types/bcrypt": "^6.0.0",
     "@types/node": "24.9.2",
-    "vite":"7.1.12",
+    "vite": "7.1.12",
     "bcrypt": "^6.0.0",
     "bcryptjs": "^2.4.3",
     "express": "^4.18.2",
@@ -25,7 +25,10 @@
     "uuid": "^9.0.0",
     "express-rate-limit": "8.1.0",
     "helmet": "8.1.0",
-    "express-validator": "7.3.0"
+    "express-validator": "7.3.0",
+    "exceljs": "4.4.0",
+    "pdfkit": "0.12.3",
+    "@types/pdfkit": "^0.12.3"
   },
   "devDependencies": {
     "@types/bcryptjs": "^2.4.2",