fix(03): add module settings page, dynamic sidebar categories

- Admin modules page at /admin/modules with toggle switches
- Sidebar categories now fetch active modules from API dynamically
- Added "Module" link under admin section in sidebar
- Added i18n keys for module management (DE + EN)

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

apps/web/src/messages/de.json

@@ -88,7 +88,8 @@
     "admin": "Verwaltung",
     "users": "Benutzer",
     "tenants": "Mandanten",
-    "ldap": "LDAP"
+    "ldap": "LDAP",
+    "modules": "Module"
   },
   "dashboard": {
     "title": "Dashboard",
@@ -126,6 +127,20 @@
       "cannotDeleteActive": "Mandanten mit aktiven Benutzern koennen nicht geloescht werden"
     }
   },
+  "adminModules": {
+    "title": "Modulverwaltung",
+    "description": "Module fuer Ihren Mandanten aktivieren oder deaktivieren",
+    "activate": "Aktivieren",
+    "deactivate": "Deaktivieren",
+    "activated": "Aktiviert",
+    "deactivated": "Deaktiviert",
+    "system": "System",
+    "version": "Version",
+    "noModules": "Keine Module verfuegbar",
+    "activateSuccess": "Modul erfolgreich aktiviert",
+    "deactivateSuccess": "Modul erfolgreich deaktiviert",
+    "error": "Fehler bei der Modulverwaltung"
+  },
   "theme": {
     "light": "Hell",
     "dark": "Dunkel",
@@ -141,7 +156,10 @@
     "noModules": "Keine aktiven Module in dieser Kategorie",
     "notFound": "Modul nicht gefunden",
     "notFoundDescription": "Das angeforderte Modul existiert nicht oder ist nicht aktiviert.",
-    "backToCategory": "Zurueck zur Kategorie"
+    "backToCategory": "Zurueck zur Kategorie",
+    "allModules": "Module",
+    "allModulesDescription": "Verfuegbare Module fuer Ihren Mandanten",
+    "noActiveModules": "Keine Module aktiviert. Bitten Sie Ihren Administrator, Module zu aktivieren."
   },
   "domaincheck": {
     "title": "Domaincheck",

apps/web/src/messages/en.json

@@ -87,7 +87,9 @@
     },
     "admin": "Administration",
     "users": "Users",
-    "tenants": "Tenants"
+    "tenants": "Tenants",
+    "ldap": "LDAP",
+    "modules": "Modules"
   },
   "dashboard": {
     "title": "Dashboard",
@@ -125,6 +127,20 @@
       "cannotDeleteActive": "Cannot delete tenants with active users"
     }
   },
+  "adminModules": {
+    "title": "Module Management",
+    "description": "Activate or deactivate modules for your tenant",
+    "activate": "Activate",
+    "deactivate": "Deactivate",
+    "activated": "Activated",
+    "deactivated": "Deactivated",
+    "system": "System",
+    "version": "Version",
+    "noModules": "No modules available",
+    "activateSuccess": "Module activated successfully",
+    "deactivateSuccess": "Module deactivated successfully",
+    "error": "Error managing module"
+  },
   "theme": {
     "light": "Light",
     "dark": "Dark",
@@ -140,7 +156,10 @@
     "noModules": "No active modules in this category",
     "notFound": "Module not found",
     "notFoundDescription": "The requested module does not exist or is not activated.",
-    "backToCategory": "Back to category"
+    "backToCategory": "Back to category",
+    "allModules": "Modules",
+    "allModulesDescription": "Available modules for your tenant",
+    "noActiveModules": "No modules activated. Ask your administrator to enable modules."
   },
   "domaincheck": {
     "title": "Domain Check",