fix: Add build-dependencies for PyTorch, Librosa, and bcrypt, and compel CPU-only PyTorch download to prevent Hugging Face Docker Container Out-Of-Memory crashes

Dockerfile

@@ -8,6 +8,8 @@ RUN apt-get update && apt-get install -y \
     git \
     nodejs \
     npm \
+    build-essential \
+    libsndfile1 \
     && apt-get clean \
     && rm -rf /var/lib/apt/lists/*
 
@@ -22,9 +24,10 @@ RUN chown -R user:user $HOME
 USER user
 
 # Copy requirements and install Python dependencies
+# Added extra-index-url for CPU-only PyTorch to prevent 3GB+ CUDA timeout/OOM crashes!
 COPY --chown=user:user backend/requirements.txt ./backend/
 RUN pip install --no-cache-dir --upgrade pip && \
-    pip install --no-cache-dir -r backend/requirements.txt
+    pip install --no-cache-dir -r backend/requirements.txt --extra-index-url https://download.pytorch.org/whl/cpu
 
 # Copy frontend package.json to install node modules
 COPY --chown=user:user frontend/package*.json ./frontend/