Bill SMS in credits and add IRT top-up in Super Admin.

Show credit balance in business settings; Super Admin tops up by IRT (adds credits) and tracks SMS sent per business.

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/business/src/services/smsTemplateService.ts

@@ -69,6 +69,9 @@ export async function getSmsCredit(signal?: AbortSignal) {
     balance: number
     /** @deprecated use balance */
     credit: number | null
+    /** Lifetime SMS messages billed (one per recipient). */
+    sentCount: number
+    unit: 'credits'
     currency: string | null
     message: string | null
   }>(smsPath('/credit'), { auth: true, signal })