fix: optional tg user fields

src/client/models/TgUserSchema.ts

@@ -4,8 +4,8 @@
 /* eslint-disable */
 export type TgUserSchema = {
     id: number;
-    firstName: string;
-    lastName: string;
-    username: string;
+    firstName: (string | null);
+    lastName: (string | null);
+    username: (string | null);
 };