Added a new registration HTML page under data/static/register.html and introduced a static file serving route in routes/static.js. Minor adjustments were made to authRepository.js and userRepository.js to update module imports. This enables serving static assets and provides a registration UI.
Moved sessionserver routes to correct directory and removed subdirectory logic from texture file lookup. Updated texture URLs to remove leading slashes and fixed endpoint concatenation. Added default textures for Alex and Steve.
