Fix dependencies for Python 3.8 compatibility

Update numpy and scipy to versions compatible with Python 3.8:
- numpy: 1.24.3 → 1.23.5
- scipy: 1.11.4 → 1.10.1

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

backend/Dockerfile

@@ -24,8 +24,9 @@ RUN pip install --no-cache-dir --upgrade pip setuptools wheel
 COPY requirements.txt .
 
 # Install Python dependencies in stages for better caching
-RUN pip install --no-cache-dir numpy==1.24.3
-RUN pip install --no-cache-dir scipy==1.11.4
+# Using versions compatible with Python 3.8
+RUN pip install --no-cache-dir numpy==1.23.5
+RUN pip install --no-cache-dir scipy==1.10.1
 
 # Install Essentia - Python 3.8 version (latest available with pre-built wheels)
 RUN ARCH=$(uname -m) && \

backend/requirements.txt

@@ -18,9 +18,9 @@ mutagen==1.47.0
 # Essentia for genre/mood/instrument classification
 # Note: Essentia is installed separately in Dockerfile from official wheels
 
-# Scientific Computing
-numpy==1.24.3
-scipy==1.11.4
+# Scientific Computing (versions compatible with Python 3.8)
+numpy==1.23.5
+scipy==1.10.1
 
 # Configuration & Validation
 pydantic==2.5.3