fix: create embeddings/log/datasets dirs; make kohya_ss clone resilient; keep embeddings dir flag

fix: add embeddings dir, persist kohya_ss, set --embeddings-dir

feat: add kohya_ss extension during Docker build

fix: resolve pip conflict by letting torch pull compatible triton; keep xformers 0.0.24

feat: Automatic1111 Docker setup (web UI on 7860)