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

frontend/src/router/index.js

@@ -20,6 +20,7 @@ import Profile from '../views/Profile.vue'
 import PasswordChange from '../views/PasswordChange.vue'
 import Timewish from '../views/Timewish.vue'
 import Roles from '../views/Roles.vue'
+import Invite from '../views/Invite.vue'
 
 const router = createRouter({
   history: createWebHistory(import.meta.env.BASE_URL),
@@ -126,6 +127,12 @@ const router = createRouter({
       component: Timewish,
       meta: { requiresAuth: true }
     },
+    {
+      path: '/settings/invite',
+      name: 'settings-invite',
+      component: Invite,
+      meta: { requiresAuth: true }
+    },
     {
       path: '/entries',
       name: 'entries',