Clean codebase: remove demographic clustering and test files

Reorganize codebase structure and fix category boosted recommendations

removed demographic amplification for zero interactions users

Fix ItemTower instantiation and clean up UI duplicates

Update raw two-tower retrieval category boost from 1.3x to 1.6x

Fix UserTower attention masking and update terminology

Clean codebase and add demographic enhancements

Add comprehensive documentation and interactive similar items feature

Major codebase cleanup and feature additions

Implement categorical demographics and improved two-tower model

initial generation