fix: force-dynamic on admin items route to prevent stale cached responses

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

estore/src/app/api/admin/items/route.ts

@@ -2,6 +2,8 @@ import { NextResponse } from 'next/server'
 import { getCatalog } from '@/lib/catalog-cache'
 import { readOverrides } from '@/lib/overrides'
 
+export const dynamic = 'force-dynamic'
+
 export async function GET() {
   try {
     const [{ items, fetchedAt }, overrides] = await Promise.all([