README: link the demo Space

New-trainer generation: Soundclash (step 500) and Chanter (step 600), demos, prompts, usage notes, one drop limitation

Add Ko-fi support blurb

Add three Frontline demos: trap-dub (current build), trap-dub dense lyric and native-caption renders from earlier builds

MLTNT Steppers / Fusion / Roots / Frontline: YuE2 militant roots reggae LoRAs