feat(portal): lead module, WHMCS sync report/contacts/mapping, service lifecycle email templates

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

app/Integrations/Whmcs/Transformers/InvoiceTransformer.php

@@ -42,7 +42,7 @@ class InvoiceTransformer
         return new InvoiceData(
             legacyId: $legacyId,
             invoiceNumber: $row['invoicenum'] ?: "WHMCS-{$legacyId}",
-            customerId: $this->customers->resolve((int) $row['userid']),
+            customerId: $this->customers->resolveFor('invoice', $row['invoicenum'] ?: $row['id'], (int) $row['userid']),
             orderId: $whmcsOrderId ? $this->orders->resolve($whmcsOrderId) : null,
             date: $this->nullableDate($row['date'] ?? null),
             subTotal: (int) round((float) $row['subtotal']),