fix(seed-forms): add confirmationMessage to both form creates

Payload forms plugin requires a Lexical rich-text confirmationMessage
when confirmationType is 'message'; omitting it caused a 500 on seed.

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

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

@@ -12,6 +12,28 @@ export async function POST(req: NextRequest): Promise<NextResponse> {
 
   const payload = await getPayload({ config })
 
+  const successMessage = (text: string) => ({
+    root: {
+      type: 'root',
+      format: '',
+      indent: 0,
+      version: 1,
+      direction: 'ltr' as const,
+      children: [
+        {
+          type: 'paragraph',
+          format: '',
+          indent: 0,
+          version: 1,
+          direction: 'ltr' as const,
+          children: [
+            { type: 'text', detail: 0, format: 0, mode: 'normal', style: '', text, version: 1 },
+          ],
+        },
+      ],
+    },
+  })
+
   // Check idempotency per form separately
   const existingBirthday = await payload.find({
     collection: 'forms',
@@ -85,6 +107,9 @@ export async function POST(req: NextRequest): Promise<NextResponse> {
         ],
         submitButtonLabel: 'Замовити святкування',
         confirmationType: 'message',
+        confirmationMessage: successMessage(
+          "Заявку отримано! Менеджер зв'яжеться з вами протягом 30 хвилин для уточнення деталей свята."
+        ),
       } as never,
       overrideAccess: true,
     }))
@@ -150,6 +175,9 @@ export async function POST(req: NextRequest): Promise<NextResponse> {
         ],
         submitButtonLabel: 'Надіслати заявку',
         confirmationType: 'message',
+        confirmationMessage: successMessage(
+          'Заявку отримано! Менеджер зателефонує вам протягом 30 хвилин для уточнення деталей.'
+        ),
       } as never,
       overrideAccess: true,
     }))