feat: add paper abstract, SVG architecture diagram, and full results tables

fix: replace all fake 99.9% metrics with honest 96.68% val accuracy

fix: animate progress bar during server inference + speed up CPU pipeline

fix: render Mamba & Layers tabs with real data from server.py

fix: scope XAI tab selector to #rp1 to not break Mamba/Layers tabs

feat: redesign Mamba & Layers tabs with real computed visualizations

fix: update URLs to retvim-demo2 space

fix: correct API_BASE URL (khamir->earther) + robust html path lookup

fix: add retvim-final.html + images/ (all binaries via LFS), fix numpy+images errors