add calendar module

server/package.json

@@ -39,6 +39,7 @@
     "passport-jwt": "^4.0.1",
     "pg": "^8.16.3",
     "reflect-metadata": "^0.2.2",
+    "rrule": "^2.8.1",
     "rxjs": "^7.8.1",
     "typeorm": "^0.3.27"
   },
@@ -53,6 +54,7 @@
     "@types/jest": "^30.0.0",
     "@types/node": "^22.10.7",
     "@types/passport-jwt": "^4.0.0",
+    "@types/rrule": "^2.1.7",
     "@types/supertest": "^6.0.2",
     "eslint": "^9.18.0",
     "eslint-config-prettier": "^10.0.1",