Add watcher routes to backend and frontend; implement routing and UI components for watcher management

frontend/src/components/SideMenu.vue

@@ -69,14 +69,6 @@ const SECTIONS_USER = [
       { label: 'Kalender', to: '/calendar' }
     ]
   },
-  {
-    title: 'Andere Nutzer',
-    hasDropdown: true,
-    items: [
-      { label: 'Liste mit Nutzernamen', to: '/users' },
-      { label: 'Berechtigungen verteilen', to: '/users/permissions' }
-    ]
-  },
   {
     title: 'Export',
     hasDropdown: false,
@@ -89,6 +81,7 @@ const SECTIONS_USER = [
       { label: 'Persönliches', to: '/settings/profile' },
       { label: 'Paßwort ändern', to: '/settings/password' },
       { label: 'Zeitwünsche', to: '/settings/timewish' },
+      { label: 'Zugriffe verwalten', to: '/settings/permissions' },
       { label: 'Einladen', to: '/settings/invite' }
     ]
   }