BarScript: serve the fitted (non-uniform) bar timeline by default; report grid source, spread and fit quality in the UI

Add BarScript (experimental preview) model + ura difficulty; vendored sc2 subpackage

Restore selectable legacy model generations

Deploy hierarchical SoftChart V1.8

Add v1.6 + v1.7 model selector (7 selectable generators); sync v1.7-capable inference bundle

Launch bold Server Mode UI and Taiko audition