Fix host binding: use 0.0.0.0 for HF Spaces proxy access

Dockerfile

@@ -28,16 +28,13 @@ WORKDIR /home/user/app/acestep
 # Install dependencies
 RUN uv sync
 
-# Write config for the API
-RUN echo 'ACESTEP_CONFIG_PATH=acestep-v15-turbo\n\
-ACESTEP_LM_MODEL_PATH=acestep-5Hz-lm-0.6B\n\
-ACESTEP_LM_BACKEND=pt\n\
-ACESTEP_API_PORT=7860\n\
-LANGUAGE=en' > .env
-
-# HF Spaces requires port 7860
+# Write config for the API (printf for proper newlines)
+RUN printf 'ACESTEP_CONFIG_PATH=acestep-v15-turbo\nACESTEP_LM_MODEL_PATH=acestep-5Hz-lm-0.6B\nACESTEP_LM_BACKEND=pt\nACESTEP_API_PORT=7860\nLANGUAGE=en\n' > .env
+
+# HF Spaces requires port 7860 and host 0.0.0.0
 ENV ACESTEP_API_PORT=7860
+ENV ACESTEP_API_HOST=0.0.0.0
 EXPOSE 7860
 
-# Start the ACE-Step API on port 7860
-CMD ["uv", "run", "acestep-api", "--port", "7860"]
+# Start the ACE-Step API on 0.0.0.0:7860
+CMD ["uv", "run", "acestep-api", "--host", "0.0.0.0", "--port", "7860"]