feat(nav): add NavGroup and NavItem components for navigation structure

components/aigc/nav/NavGroup.vue

@@ -0,0 +1,7 @@
+<script lang="ts" setup></script>
+
+<template>
+  <div></div>
+</template>
+
+<style scoped></style>

components/aigc/nav/NavItem.vue

@@ -1,25 +1,16 @@
 <script setup lang="ts">
-const props = defineProps({
-  icon: {
-    type: String,
-    default: 'i-tabler-photo-filled',
-  },
-  label: {
-    type: String,
-    required: true,
-  },
-  to: {
-    type: String,
-    required: true,
-  },
-  admin: {
-    type: Boolean,
-    default: false,
-  },
-  hide: {
-    type: Boolean,
-    default: false,
-  },
+export type NavItemProps = {
+  label: string
+  icon: string
+  to: string
+  admin?: boolean
+  hide?: boolean
+}
+
+const props = withDefaults(defineProps<NavItemProps>(), {
+  icon: 'i-tabler-photo-filled',
+  admin: false,
+  hide: false,
 })
 
 const route = useRoute()