docs: Update Dockerfile with git dependency and ZeroGPU configuration notes

- Add git to system dependencies (was missing)
- Add ZeroGPU API environment variable documentation
- Document both service account and per-user mode configuration options

Dockerfile

@@ -2,7 +2,7 @@
 # This is the main Dockerfile used by HF Spaces when sdk: docker is set
 FROM python:3.10-slim
 
-# System dependencies
+# System dependencies (ADD GIT HERE)
 RUN apt-get update && apt-get install -y \
     gcc \
     g++ \
@@ -10,6 +10,7 @@ RUN apt-get update && apt-get install -y \
     libopenblas-dev \
     libomp-dev \
     curl \
+    git \
     && rm -rf /var/lib/apt/lists/*
 
 # Set working directory
@@ -35,5 +36,15 @@ HEALTHCHECK --interval=30s --timeout=30s --start-period=60s --retries=3 \
 
 # Run main.py (starts both Gradio and Flask API)
 # main.py starts Flask API in background thread and launches Gradio
+#
+# ZeroGPU API Configuration (optional):
+# Set these environment variables in HF Spaces secrets for ZeroGPU integration:
+# - USE_ZERO_GPU=true (enable ZeroGPU API)
+# - ZERO_GPU_API_URL=http://your-pod-ip:8000
+# - ZERO_GPU_EMAIL=service@example.com (for service account mode)
+# - ZERO_GPU_PASSWORD=your-password (for service account mode)
+# - ZERO_GPU_PER_USER_MODE=true (for per-user mode, optional)
+# - ZERO_GPU_ADMIN_EMAIL=admin@example.com (for per-user mode)
+# - ZERO_GPU_ADMIN_PASSWORD=admin-password (for per-user mode)
 CMD ["python", "main.py"]