chore(backend): Setup MikroORM

Simpele configuratie, geen integratie
Succesvol commando's uitvoeren werkt

backend/package.json

@@ -20,13 +20,19 @@
   },
   "homepage": "https://sel2-1.ugent.be/",
   "dependencies": {
+    "@mikro-orm/core": "^6.4.6",
+    "@mikro-orm/reflection": "^6.4.6",
+    "@mikro-orm/postgresql": "^6.4.6",
     "dotenv": "^16.4.7",
     "express": "^5.0.1"
   },
   "devDependencies": {
+    "@mikro-orm/cli": "^6.4.6",
     "@types/express": "^5.0.0",
     "@types/node": "^22.13.4",
+    "ts-node": "^10.9.2",
     "tsx": "^4.19.3",
-    "typescript": "^5.7.3"
+    "typescript": "^5.7.3",
+    "vitest": "^3.0.6"
   }
 }