pre-download training checkpoints at build time

Dockerfile

@@ -78,6 +78,11 @@ RUN pip3 install --no-cache-dir --extra-index-url https://download.pytorch.org/w
 # Clone ACE-Step repo for training module
 RUN git clone --depth 1 https://github.com/ace-step/ACE-Step-1.5 /app/ace-step-source
 
+# Pre-download training checkpoints (avoids 10GB runtime download)
+RUN python3 -c "from huggingface_hub import snapshot_download; \
+    snapshot_download('ACE-Step/Ace-Step1.5', local_dir='/app/checkpoints', \
+    ignore_patterns=['*.md', '*.txt', '.gitattributes'])"
+
 # Copy application files
 COPY app.py /app/app.py
 COPY start.sh /app/start.sh