Add static/audio folder and update Dockerfile

Dockerfile

@@ -8,8 +8,8 @@ COPY requirements.txt .
 RUN pip install --no-cache-dir -r requirements.txt
 
 # Create writable directories
-RUN mkdir -p /data/hf_cache /data/transformers_cache /data/nltk_data /data/audio
-RUN chmod -R 777 static/audio
+RUN mkdir -p /data/hf_cache /data/transformers_cache /data/nltk_data /static/audio
+RUN chmod -R 777 /static/audio
 
 # Set environment variables
 ENV HF_HOME=/data/hf_cache