feat(helpdesk): add Domains list page with BC OData contract type enrichment

Add a new "Domains" page to the helpdesk module that fetches domain data
from the FS_Contract_Domains OData endpoint and enriches each domain with
its contract type (PI_Header_Type) by joining with FS_Contract_Lines_Test
where Type = 'Domain'.

New files:
- domains/index().php, index(default).phtml, filter-schema.php — list page
- domains-data().php — data endpoint with PHP-side filtering/sorting
- helpdesk-domains-index.js — Grid.js via initStandardListPage()

Gateway additions:
- listDomains() — fetch all contract domains
- listDomainContractLines() — fetch domain-type contract lines for type lookup

Sidebar restructured into three collapsible groups (Lookup, Monitoring,
Administration) with per-group icons and color coding, matching the core
admin panel pattern.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

modules/helpdesk/templates/aside-helpdesk-panel.phtml

@@ -9,55 +9,85 @@ $canViewRiskRadar = !empty($helpdeskNav['can_view_risk_radar']);
 $settingsActive = navActive('helpdesk/settings', true);
 $teamActive = navActive('helpdesk/team', true);
 $riskRadarActive = navActive('helpdesk/risk-radar', true);
+$domainsActive = navActive('helpdesk/domains', true);
 $customersActive = navActive('helpdesk', true);
-if ($settingsActive['isActive'] || $teamActive['isActive'] || $riskRadarActive['isActive']) {
+if ($settingsActive['isActive'] || $teamActive['isActive'] || $riskRadarActive['isActive'] || $domainsActive['isActive']) {
     $customersActive = ['class' => '', 'aria' => '', 'isActive' => false];
 }
 
-$helpdeskNavItems = [
+$helpdeskNavGroups = [
     [
-        'label' => t('Customers'),
-        'path' => 'helpdesk',
-        'active' => $customersActive,
-        'visible' => true,
+        'key' => 'helpdesk-lookup',
+        'label' => t('Lookup'),
+        'icon' => 'bi-search',
+        'items' => [
+            [
+                'label' => t('Customers'),
+                'path' => 'helpdesk',
+                'active' => $customersActive,
+                'visible' => true,
+            ],
+            [
+                'label' => t('Domains'),
+                'path' => 'helpdesk/domains',
+                'active' => $domainsActive,
+                'visible' => true,
+            ],
+        ],
     ],
     [
-        'label' => t('Team workload'),
-        'path' => 'helpdesk/team',
-        'active' => $teamActive,
-        'visible' => $canViewTeam,
+        'key' => 'helpdesk-monitoring',
+        'label' => t('Monitoring'),
+        'icon' => 'bi-bar-chart-line',
+        'items' => [
+            [
+                'label' => t('Team workload'),
+                'path' => 'helpdesk/team',
+                'active' => $teamActive,
+                'visible' => $canViewTeam,
+            ],
+            [
+                'label' => t('Risk radar'),
+                'path' => 'helpdesk/risk-radar',
+                'active' => $riskRadarActive,
+                'visible' => $canViewRiskRadar,
+            ],
+        ],
     ],
     [
-        'label' => t('Risk radar'),
-        'path' => 'helpdesk/risk-radar',
-        'active' => $riskRadarActive,
-        'visible' => $canViewRiskRadar,
-    ],
-    [
-        'label' => t('Settings'),
-        'path' => 'helpdesk/settings',
-        'active' => $settingsActive,
-        'visible' => $canManageSettings,
+        'key' => 'helpdesk-administration',
+        'label' => t('Administration'),
+        'icon' => 'bi-sliders',
+        'items' => [
+            [
+                'label' => t('Settings'),
+                'path' => 'helpdesk/settings',
+                'active' => $settingsActive,
+                'visible' => $canManageSettings,
+            ],
+        ],
     ],
 ];
-
-$visibleItems = array_values(array_filter($helpdeskNavItems, static fn (array $item): bool => !empty($item['visible'])));
-$groupIsActive = false;
-foreach ($visibleItems as $item) {
-    $activeState = $item['active'] ?? [];
-    if (!empty($activeState['isActive'])) {
-        $groupIsActive = true;
-        break;
-    }
-}
 ?>
-<ul class="app-sidebar-admin-nav" aria-label="<?php e(t('Helpdesk')); ?>">
-    <?php if ($visibleItems): ?>
+<ul>
+    <?php foreach ($helpdeskNavGroups as $group):
+        $visibleItems = array_values(array_filter($group['items'], static fn (array $item): bool => !empty($item['visible'])));
+        if (!$visibleItems) {
+            continue;
+        }
+        $groupIsActive = false;
+        foreach ($visibleItems as $item) {
+            if (!empty(($item['active'] ?? [])['isActive'])) {
+                $groupIsActive = true;
+                break;
+            }
+        }
+    ?>
         <li class="app-sidebar-group app-sidebar-admin-group">
-            <details data-details-key="helpdesk-navigation"<?php if ($groupIsActive): ?> open<?php endif; ?>>
+            <details data-details-key="<?php e($group['key']); ?>"<?php if ($groupIsActive): ?> open<?php endif; ?>>
                 <summary>
-                    <i class="bi bi-headset"></i>
-                    <span><?php e(t('Helpdesk')); ?></span>
+                    <i class="bi <?php e($group['icon']); ?>"></i>
+                    <span><?php e($group['label']); ?></span>
                 </summary>
                 <ul>
                     <?php foreach ($visibleItems as $item):
@@ -72,5 +102,5 @@ foreach ($visibleItems as $item) {
                 </ul>
             </details>
         </li>
-    <?php endif; ?>
+    <?php endforeach; ?>
 </ul>