Replaces all PWA, Android, Apple touch, and favicon assets with the
custom Lotus Chat logo (lotus_chat.png, 1254x1254 source).
Adds attribution section to README per CC BY 4.0 requirements:
the logo is a derivative of the original Cinny logo by Ajay Bura,
used under CC BY 4.0, and the modified version is likewise CC BY 4.0.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
