README title tweak; update male1 voice style

Use two voices only (Female/Male); drop female2 and male2

Update male1 voice style

Update app.py and voice styles (female2, male1)

Add four voices: Female 1/2, Male 1/2; rotate examples across voices

Update female1 voice style

Sync: app updates, remove obsolete files

Ship new female voice style (female1.json); drop missing male1

Clean release: multi-language BlueTTS with improved UI