fix(seed-forms): always run updateGlobal — fixes re-link on partial state

Remove early-return guard that skipped global linking when both forms already existed. Per-form idempotency is handled by the '?? await payload.create()' pattern, so we can safely always run updateGlobal to ensure forms are linked to their globals even after re-runs.

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

src/app/api/admin/seed-forms/route.ts

@@ -47,9 +47,6 @@ export async function POST(req: NextRequest): Promise<NextResponse> {
     limit: 1,
     overrideAccess: true,
   })
-  if (existingBirthday.totalDocs >= 1 && existingGroup.totalDocs >= 1) {
-    return NextResponse.json({ message: 'Forms already seeded', count: 2 })
-  }
 
   // ── 1. Birthday form ──────────────────────────────────────────────
   const birthdayForm =