feat(hunt): add public flag to hunts and implement hunt creation page

- Add 'public' boolean column to Hunt model with default true
- Update hunt admin UI to toggle 'public' flag
- Implement new hunt creation page with form supporting all hunt properties
- Add sidebar navigation item for hunt creation for authorized users
- Adjust home API to filter hunts by public flag only

app/layouts/default.vue

@@ -60,6 +60,18 @@ const isHuntAdmin = computed(
             <VaSidebarItemTitle>Home</VaSidebarItemTitle>
           </VaSidebarItemContent>
         </VaSidebarItem>
+        <VaSidebarItem
+          v-if="user?.role === 'CREATOR' || user?.role === 'ADMIN'"
+          :to="localePath('/admin/hunt/create')"
+          :active="localePath('/admin/hunt/create') === route.path"
+        >
+          <VaSidebarItemContent>
+            <VaIcon name="add_circle" />
+            <VaSidebarItemTitle>{{
+              t('page.create_hunt.sidebar')
+            }}</VaSidebarItemTitle>
+          </VaSidebarItemContent>
+        </VaSidebarItem>
         <VaSidebarItem
           :to="localePath('/impressum')"
           :active="localePath('/impressum') === route.path"