FIX: All bug in Custom Enemy, UPDATE: Add specical main skill, optimaze ui in custom enemy

src/app/api/[locale]/monster/[id]/route.ts

@@ -0,0 +1,18 @@
+import { NextRequest, NextResponse } from 'next/server'
+import { loadMonster } from '@/lib/loader'
+
+export async function GET(
+  req: NextRequest,
+  { params }: { params: Promise<{ id: string, locale: string }> }
+) {
+
+  const { id, locale } = await params
+  const monsterData = await loadMonster([id], locale)
+  const monster = monsterData[id]
+
+  if (!monster) {
+    return NextResponse.json({ error: 'Monster info not found' }, { status: 404 })
+  }
+
+  return NextResponse.json(monster)
+}