Add BLAS/LAPACK libraries and upgrade scipy to 1.13.1 with wheel priority

Dockerfile

@@ -1,11 +1,12 @@
 FROM python:3.10-slim
 
-# Install system dependencies including build tools for webrtcvad
+# Install system dependencies including build tools and BLAS/LAPACK for scipy
 RUN apt-get update && apt-get install -y \
     build-essential \
     libsndfile1 libsndfile1-dev \
     ffmpeg \
     git \
+    libblas-dev liblapack-dev gfortran \
     && rm -rf /var/lib/apt/lists/*
 
 WORKDIR /app
@@ -13,8 +14,9 @@ WORKDIR /app
 # Copy entire project
 COPY . .
 
-# Install Python dependencies
-RUN pip install --no-cache-dir -r backend/requirements.txt
+# Install Python dependencies with pre-built wheels priority
+RUN pip install --no-cache-dir --only-binary :all: -r backend/requirements.txt || \
+    pip install --no-cache-dir -r backend/requirements.txt
 
 # Note: Models will be downloaded on first request
 # Skipping download_models.py to avoid build timeout on HF Spaces

backend/requirements.txt

@@ -7,7 +7,7 @@ soundfile==0.12.1
 numpy==1.24.3
 huggingface_hub==0.19.4
 matplotlib==3.7.2
-scipy==1.11.2
+scipy==1.13.1
 scikit-learn==1.3.0
 unidecode==1.3.0
 inflect==7.0.0