Coupon and promotion manager with inline redemption rule editor

reui/solution-billing-9

Manage coupon and promo codes; each row expands inline to edit discount type, duration, redemption limits, and eligible plans. ReUI Badge, Frame; shadcn Button, Collapsible, Dialog, Select. Discount admin, promo codes, billing settings.

Paid component: its registry needs a licence from the library, so install it from their site.