Add T6 Zombies fleet support with Plutainer configuration

src/routes/api/maps/+server.ts

@@ -1,6 +1,6 @@
 import { json } from '@sveltejs/kit';
-import { T5_ZOMBIE_MAPS } from '$lib/server/fleet/map-aliases.js';
+import { T5_ZOMBIE_MAPS, T6_ZOMBIE_MAPS } from '$lib/server/fleet/map-aliases.js';
 
 export function GET() {
-    return json({ t5Zombie: T5_ZOMBIE_MAPS });
+    return json({ t5Zombie: T5_ZOMBIE_MAPS, t6Zombie: T6_ZOMBIE_MAPS });
 }