Studio migration placeholder

Studio

This will replace `v4/settings/portal-premium.php` in phases. The first real implementation should load existing `wedding_details`, save a small basic payload, then render `/:userId/:slug` dynamically.

• Step 1Pilih Design
• Step 2Maklumat Pengantin
• Step 3Maklumat Majlis
• Step 4Lagu Background
• Step 5Gambar Slide
• Step 6e-Kaut
• Step 7Notifikasi Telegram
• Step 8Senarai Hadiah
• Step 9Guest POV