api client refactor

apps/website/lib/dtos/MembershipFeeDto.ts

@@ -0,0 +1,10 @@
+/**
+ * Membership fee data transfer object
+ * Represents a membership fee for a league
+ */
+export interface MembershipFeeDto {
+  leagueId: string;
+  amount: number;
+  currency: string;
+  period: string;
+}