Fix Seed-VC startup readiness and clarify Applio models

experiments/seed-vc/Dockerfile

@@ -3,7 +3,8 @@ FROM nvidia/cuda:12.8.1-cudnn-runtime-ubuntu22.04
 ARG SEED_VC_COMMIT=51383efd921027683c89e5348211d93ff12ac2a8
 ENV DEBIAN_FRONTEND=noninteractive \
     PIP_DISABLE_PIP_VERSION_CHECK=1 \
-    HF_HOME=/models/huggingface
+    HF_HOME=/models/huggingface \
+    PYTHONUNBUFFERED=1
 
 RUN apt-get update && apt-get install -y --no-install-recommends \
       build-essential ca-certificates curl ffmpeg git libsndfile1 python3 python3-dev python3-pip \
@@ -17,7 +18,8 @@ RUN git clone https://github.com/Plachtaa/seed-vc.git . \
        torch==2.7.1 torchvision==0.22.1 torchaudio==2.7.1 \
        --index-url https://download.pytorch.org/whl/cu128 \
     && python3 -m pip install --no-cache-dir -r requirements.txt \
-    && sed -i 's/demo\.launch()/demo.launch(server_name="0.0.0.0", server_port=7860)/' app.py
+    && sed -i 's/demo\.launch()/demo.launch(server_name="0.0.0.0", server_port=7860)/' app.py \
+    && sed -i '/if args.enable_v1:/a\        print("Loading V1 models...", flush=True)\n        from seed_vc_wrapper import SeedVCWrapper\n        vc_wrapper_v1 = SeedVCWrapper()\n        print("V1 models ready.", flush=True)' app.py
 
 EXPOSE 7860
 CMD ["python3", "app.py", "--enable-v1"]