Antigravity Business Website with Admin

i already build a web site with google antigravity i need developer to launch it. I need a clean, fast-loading business site built on the Antigravity framework and deployed with a straightforward admin area so I can update pages, images and text without touching code.

Core features I must see live on launch:
• Contact form that delivers to my primary email and logs submissions in the dashboard
• Service showcase pages I can add, edit or hide from the admin panel
• WhatsApp click-to-chat button fixed on mobile and desktop views
• Product gallery with lightbox, captions and drag-and-drop re-ordering in the back-end

The design has to be fully responsive, follow current accessibility basics (contrast, alt tags, semantic markup) and load quickly under average 4G conditions. Once the build is complete, please migrate everything to my hosting, set up SSL and create one admin account for me with clear written instructions or a short screen-share walkthrough so I can manage the site myself.

If you have prior experience with Antigravity or a comparable lightweight CMS, mention a couple of live links; it will help me choose faster.