Fix Daniya GPT-SoVITS training space

refactor v3: proper Docker Space per official docs (user 1000, Gradio 5.x, Python 3.11)

fix: add --force-reinstall to actually downgrade huggingface_hub

fix: minimal Dockerfile - only downgrade huggingface_hub after base

refactor v2: drop Dockerfile, lazy-install GPT-SoVITS at runtime, pin huggingface_hub<0.27

fix: remove conflicting deps from requirements.txt, move jinja2 fix to Dockerfile

fix: pin huggingface_hub<1.0 to keep HfFolder for Gradio 4.x compat

fix: filter Gradio/WebUI deps from GPT-SoVITS requirements (downgrades base)

fix: use HF Spaces Dockerfile format (no FROM), base image handles Gradio

refactor: full rewrite with Dockerfile + Gradio 5.x