feat(billing): Convert referral bonuses from monthly recurring to one-time credits, and bump them from 250 -> 500

common/src/constants/grant-priorities.ts

@@ -1,10 +1,12 @@
 import type { GrantType } from '@codebuff/common/types/grant'
 
+// Lower = consumed first
 export const GRANT_PRIORITIES: Record<GrantType, number> = {
   subscription: 10,
   free: 20,
-  referral: 30,
+  referral_legacy: 30, // Legacy recurring referrals (renews monthly, consumed first)
   ad: 40,
+  referral: 50, // One-time referrals (never expires, preserved longer)
   admin: 60,
   organization: 70,
   purchase: 80,

common/src/constants/limits.ts

@@ -5,7 +5,7 @@ export const MAX_DATE = new Date(86399999999999)
 export const BILLING_PERIOD_DAYS = 30
 export const SESSION_MAX_AGE_SECONDS = 30 * 24 * 60 * 60 // 30 days
 export const SESSION_TIME_WINDOW_MS = 30 * 60 * 1000 // 30 minutes - used for matching sessions created around fingerprint creation
-export const CREDITS_REFERRAL_BONUS = 250
+export const CREDITS_REFERRAL_BONUS = 500
 export const AFFILIATE_USER_REFFERAL_LIMIT = 500
 
 // Default number of free credits granted per cycle

common/src/types/grant.ts

@@ -1,6 +1,7 @@
 export type GrantType =
   | 'free'
   | 'referral'
+  | 'referral_legacy'
   | 'subscription'
   | 'purchase'
   | 'admin'
@@ -10,6 +11,7 @@ export type GrantType =
 export const GrantTypeValues = [
   'free',
   'referral',
+  'referral_legacy',
   'subscription',
   'purchase',
   'admin',