feat(backend): Entities toegevoegd

Entites Class, Class Join Request, Class Invitation, Assignment, Group en entities om de Dwengo-leerinhoud te modelleren, toegevoegd.

package-lock.json

@@ -7,6 +7,7 @@
         "": {
             "name": "dwengo-1-monorepo",
             "version": "0.0.1",
+            "license": "MIT",
             "workspaces": [
                 "backend",
                 "frontend"
@@ -26,13 +27,13 @@
         "backend": {
             "name": "dwengo-1-backend",
             "version": "0.0.1",
-            "license": "MIT",
             "dependencies": {
                 "@mikro-orm/core": "^6.4.6",
                 "@mikro-orm/postgresql": "^6.4.6",
                 "@mikro-orm/reflection": "^6.4.6",
                 "dotenv": "^16.4.7",
-                "express": "^5.0.1"
+                "express": "^5.0.1",
+                "uuid": "^11.1.0"
             },
             "devDependencies": {
                 "@mikro-orm/cli": "^6.4.6",
@@ -8021,6 +8022,18 @@
                 "node": ">= 0.4.0"
             }
         },
+        "node_modules/uuid": {
+            "version": "11.1.0",
+            "resolved": "https://registry.npmjs.org/uuid/-/uuid-11.1.0.tgz",
+            "integrity": "sha512-0/A9rDy9P7cJ+8w1c9WD9V//9Wj15Ce2MPz8Ri6032usz+NfePxx5AcN3bN+r6ZL6jEo066/yNYB3tn4pQEx+A==",
+            "funding": [
+                "https://github.com/sponsors/broofa",
+                "https://github.com/sponsors/ctavan"
+            ],
+            "bin": {
+                "uuid": "dist/esm/bin/uuid"
+            }
+        },
         "node_modules/v8-compile-cache-lib": {
             "version": "3.0.1",
             "resolved": "https://registry.npmjs.org/v8-compile-cache-lib/-/v8-compile-cache-lib-3.0.1.tgz",