Add versioned figures manifest support

Fix metrics loading and restructure pytest suite

fix: recommendation system

fix: metrics/dataset

fix: dropdown and frontend

fix: made download background and ui sub menu for model select

fix: frontend metrics & added model selection for recommendations

fix:v3

refactor: fix the docs and dynamic model load

fix: correct v3 feature order (FEAT_SCALAR+6), fix 0 SOH predictions

feat: v3 models - XGBoost R2=0.9866, GradientBoosting R2=0.9860 as default

feat: full project — ML simulation, dashboard UI, models on HF Hub