fix: odkaz Otvorit v Brevo vedie priamo na upravu kampane (uloha 17)

Namiesto napevno zadaneho zoznamu kampani (404) sa odkaz sklada z ID
kampane: app.brevo.com/marketing-campaign/edit/{id}.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/app/api/brevo/verify/route.ts

@@ -1,4 +1,5 @@
 import { NextRequest, NextResponse } from 'next/server';
+import { getBrevoCampaignUrl } from '@/lib/brevo';
 
 export async function GET(req: NextRequest) {
   try {
@@ -51,7 +52,7 @@ export async function GET(req: NextRequest) {
       name: data.name,
       status: data.status,
       subject: data.subject,
-      brevoUrl: 'https://app.brevo.com/campaigns/listing',
+      brevoUrl: getBrevoCampaignUrl(data.id),
       brevoListingUrl: 'https://app.brevo.com/campaigns/listing'
     });
   } catch (err: any) {