fix: correct mailbox endpoint path and quota field name

- get_domain_mailboxes: was POST /api/v1/get/mailboxes/{domain},
  correct path is GET /api/v1/get/mailbox/all/{domain}
- Quota percentage field is percent_in_use, not quota_used_in_percent

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

assets/js/woocow-account.js

@@ -57,7 +57,7 @@
 
             let html = '';
             boxes.forEach(m => {
-                const pct  = parseFloat(m.quota_used_in_percent || 0);
+                const pct  = parseFloat(m.percent_in_use || 0);
                 const used = formatMB(m.quota_used);
                 const max  = formatMB(m.quota);
                 const col  = pct > 85 ? '#e74c3c' : pct > 60 ? '#f39c12' : '#27ae60';