feat: Implement (most) API endpoints

backend/src/security/auth.ts

@@ -31,14 +31,9 @@ export async function performLogin(username: string, password: string, db: Db):
             username: user.username,
             uid: user.uid,
             showWelcome: user.showWelcome,
-            //@ts-ignore
+            score: user.score,
             classId: user.classId,
 
-            lastReview: user.lastReview,
-            lastLevel: user.lastLevel,
-
-            // TODO: Implement
-            score: 4,
             sessionToken,
         };
     } else {