🐛 Booking & vCard Plus Bug Fixes + Timezone Improvements

We've fixed several bugs reported by users and improved timezone handling across the platform.

Bug Fixes:

✅ Singapore Timezone Added — Now available in all CMS dropdowns: Booking, vCard Plus, Event, Menu, and Business QR types.
✅ Timezone Conversion for Visitors — Booking landing pages now convert available time slots to the visitor's local timezone automatically. No more confusion when business and visitor are in different timezones.
✅ $0 Price Hidden — Free services no longer display "$0" on the booking page. The price simply doesn't appear when it's free.
✅ vCard Plus Type Labels — Phone numbers, emails, and websites now show type labels (Work, Home, Mobile, etc.) in a smaller, subtle font for better readability.