feat(admin): implement promotions management and loyalty points configuration

apps/backend/src/routes/settings.ts

@@ -40,6 +40,7 @@ export const settingsRoute = new Elysia({ prefix: "/settings" })
       shippingFee: t.Number(),
       bankName: t.String(),
       bankAccountName: t.String(),
-      bankAccountNumber: t.String()
+      bankAccountNumber: t.String(),
+      pointsEarnRate: t.Number()
     })
   });