Implemented api key crud and started adding system page. Added 404 page

Moonlight.Shared/Http/Requests/Admin/ApiKeys/CreateApiKeyRequest.cs

@@ -0,0 +1,15 @@
+using System.ComponentModel.DataAnnotations;
+
+namespace Moonlight.Shared.Http.Requests.Admin.ApiKeys;
+
+public class CreateApiKeyRequest
+{
+    [Required(ErrorMessage = "You need to specify a description")]
+    public string Description { get; set; }
+    
+    [Required(ErrorMessage = "You need to specify permissions for the api key")]
+    public string PermissionsJson { get; set; } = "[]";
+    
+    [Required(ErrorMessage = "You need to specify an expire date")]
+    public DateTime ExpiresAt { get; set; }
+}