fix: SMTP SSL/TLS checkboxes not reflecting actual config in admin settings

The EmailStatusResponse didn't include smtp_use_tls/smtp_use_ssl fields,
and the JavaScript hardcoded defaults (TLS=true, SSL=false) instead of
reading from the API response. Now the API returns the effective values
and the UI displays them correctly.

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

app/modules/core/static/admin/js/settings.js

@@ -356,8 +356,8 @@ function adminSettings() {
                 smtp_port: this.emailSettings.smtp_port || 587,
                 smtp_user: this.emailSettings.smtp_user || '',
                 smtp_password: '', // Never populated from API
-                smtp_use_tls: true,
-                smtp_use_ssl: false,
+                smtp_use_tls: this.emailSettings.smtp_use_tls ?? true,
+                smtp_use_ssl: this.emailSettings.smtp_use_ssl ?? false,
                 sendgrid_api_key: '',
                 mailgun_api_key: '',
                 mailgun_domain: this.emailSettings.mailgun_domain || '',