refactor: enhance character data transformation and improve fetching logic in character-related scripts

src/routes/(admin)/admin/+layout.svelte

@@ -1,6 +1,7 @@
 <script lang="ts">
 	import { page } from '$app/stores';
 	import ProfileButton from '$lib/components/ProfileButton.svelte';
+	import { resolve } from '$app/paths';
 
 	let { children, data } = $props();
 
@@ -29,9 +30,9 @@
 			<h2 class="text-lg font-black uppercase tracking-[0.15em] text-amber-50">Admin</h2>
 		</div>
 		<nav class="flex-1 space-y-2 px-3">
-			{#each navItems as item}
+			{#each navItems as item (item.label)}
 				<a
-					href={item.href}
+					href={resolve(item.href)}
 					class={`flex items-center gap-3 rounded-lg px-4 py-3 text-sm font-medium transition-colors ${
 						isActive(item.href, $page.url.pathname)
 							? 'bg-amber-600 text-white'
@@ -45,7 +46,7 @@
 		</nav>
 		<div class="border-t border-white/5 p-3">
 			<a
-				href="/"
+				href={resolve('/')}
 				class="flex items-center gap-2 rounded-lg px-4 py-3 text-sm font-medium text-gray-300 transition-colors hover:bg-slate-800 hover:text-white"
 				title="Return to site"
 			>