feat(helpdesk): add dashboards, communication feed, settings UI and fix routing

Add support/sales/controlling dashboards with KPIs, trend charts and
risk indicators. Add debitor communication timeline, contact filters,
system recommendations engine, and configurable controlling risk rules.

Rename search→index to fix query-string preservation on back navigation.
Remove fake escalation rate metric, add KPI info tooltips, and switch
trend chart colors to red (created) / green (closed) for clarity.

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

tests/Architecture/ListContractFiles.php

@@ -92,7 +92,7 @@ trait ListContractFiles
     {
         return [
             'modules/addressbook/pages/address-book/index(default).phtml',
-            'modules/helpdesk/pages/helpdesk/search(default).phtml',
+            'modules/helpdesk/pages/helpdesk/index(default).phtml',
             'pages/search/index(default).phtml',
             'pages/admin/users/index(default).phtml',
             'pages/admin/tenants/index(default).phtml',
@@ -115,7 +115,7 @@ trait ListContractFiles
     {
         return [
             'modules/addressbook/pages/address-book/index().php',
-            'modules/helpdesk/pages/helpdesk/search().php',
+            'modules/helpdesk/pages/helpdesk/index().php',
             'pages/search/index().php',
             'pages/admin/users/index().php',
             'pages/admin/tenants/index().php',
@@ -138,7 +138,7 @@ trait ListContractFiles
     {
         return [
             'modules/addressbook/pages/address-book/index(default).phtml',
-            'modules/helpdesk/pages/helpdesk/search(default).phtml',
+            'modules/helpdesk/pages/helpdesk/index(default).phtml',
             'pages/admin/users/index(default).phtml',
             'pages/admin/tenants/index(default).phtml',
             'pages/admin/departments/index(default).phtml',