Add server deployment support with Essentia

- Add install-server.sh for easy deployment on Linux servers
- Update Dockerfile to auto-detect architecture (x86_64/ARM64)
- Add deploy.sh for remote deployment
- Update requirements.txt with Essentia support notes

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

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

backend/Dockerfile

@@ -26,6 +26,23 @@ 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
+
+# Install Essentia - detect architecture and install appropriate wheel
+RUN ARCH=$(uname -m) && \
+    if [ "$ARCH" = "x86_64" ]; then \
+        echo "Installing Essentia for x86_64..." && \
+        pip install --no-cache-dir --trusted-host essentia.upf.edu \
+            https://essentia.upf.edu/python-wheels/essentia-2.1_beta6.dev374-cp311-cp311-manylinux_2_17_x86_64.manylinux2014_x86_64.whl || \
+        echo "Essentia installation failed, using fallback mode"; \
+    elif [ "$ARCH" = "aarch64" ]; then \
+        echo "Installing Essentia for aarch64..." && \
+        pip install --no-cache-dir --trusted-host essentia.upf.edu \
+            https://essentia.upf.edu/python-wheels/essentia-2.1_beta6.dev374-cp311-cp311-manylinux_2_17_aarch64.manylinux2014_aarch64.whl || \
+        echo "Essentia installation failed, using fallback mode"; \
+    else \
+        echo "Unsupported architecture: $ARCH, using fallback mode"; \
+    fi
+
 RUN pip install --no-cache-dir -r requirements.txt
 
 # Copy application code