feat: SaaS price plan frontend (#1683)

Co-authored-by: StyleZhang <jasonapring2015@outlook.com>

web/service/billing.ts

@@ -0,0 +1,14 @@
+import { get } from './base'
+import type { CurrentPlanInfoBackend, SubscriptionUrlsBackend } from '@/app/components/billing/type'
+
+export const fetchCurrentPlanInfo = () => {
+  return get<Promise<CurrentPlanInfoBackend>>('/billing/info')
+}
+
+export const fetchSubscriptionUrls = (plan: string, interval: string) => {
+  return get<Promise<SubscriptionUrlsBackend>>(`/billing/subscription?plan=${plan}&interval=${interval}`)
+}
+
+export const fetchBillingUrl = () => {
+  return get<Promise<{ url: string }>>('/billing/invoices')
+}