chore: some refactors

JOBot.Backend/Services/gRPC/UserService.cs

@@ -33,4 +33,11 @@ public class UserService(AppDbContext dbContext) : User.UserBase
             Success = false
         });
     }
+
+    public override Task<GetUserResponse> GetUser(
+        GetUserRequest request, 
+        ServerCallContext context)
+    {
+        return null;
+    }
 }