add validation middleware and improve REST API structure

package.json

@@ -7,7 +7,9 @@
     "start-local": "tsc && cross-env NODE_ENV=development node dist/index.js",
     "clean": "rimraf dist",
     "build": "npm run clean & tsc",
-    "test": "echo \"Error: no test specified, please add them later\""
+    "test": "vitest run",
+    "test:watch": "vitest",
+    "test:coverage": "vitest run --coverage"
   },
   "keywords": [],
   "author": "",
@@ -24,6 +26,7 @@
     "cors": "^2.8.5",
     "dotenv": "^16.4.4",
     "express": "5.0.0",
+    "express-rate-limit": "^8.1.0",
     "jsonwebtoken": "^9.0.2",
     "mongoose": "^8.8.2",
     "openweather-api-node": "^3.1.5",
@@ -34,7 +37,10 @@
   },
   "devDependencies": {
     "@types/cors": "^2.8.17",
+    "@types/supertest": "^6.0.3",
     "cross-env": "^7.0.3",
-    "prettier": "^3.2.5"
+    "prettier": "^3.2.5",
+    "supertest": "^7.1.4",
+    "vitest": "^2.1.9"
   }
 }