feat: add PlanPrice interface and update Plan/Subscription types

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

website/resources/ts/types/index.ts

@@ -45,6 +45,14 @@ export interface SharedPageProps {
   domains: DomainProps
 }
 
+export interface PlanPrice {
+  id: number
+  plan_id: number
+  billing_cycle: 'monthly' | 'quarterly' | 'semi_annual' | 'annual'
+  price: string
+  stripe_price_id: string | null
+}
+
 export interface Plan {
   id: number
   name: string
@@ -57,6 +65,7 @@ export interface Plan {
   stock_quantity: number | null
   status: string
   sort_order: number
+  prices?: PlanPrice[]
 }
 
 export interface Subscription {
@@ -64,6 +73,7 @@ export interface Subscription {
   type: string
   stripe_status: string
   gateway: string
+  billing_cycle: 'monthly' | 'quarterly' | 'semi_annual' | 'annual' | null
   current_period_start: string | null
   current_period_end: string | null
   ends_at: string | null