Add multi-camera support and CSI camera server

- main_multi.py: Multi USB camera support with ID-based endpoints
  - Config via CAMERAS env: '{"basement": 0, "basement2": 1}'
  - Endpoints: /snapshot (default), /snapshot/{cam_id}

- server-csi/: New server for Pi CSI ribbon cameras (IR support)
  - Auto-detects picamera2/picamera/libcamera-still
  - IR_MODE and ROTATION settings
  - Includes setup.sh for easy Pi deployment

Built with 💕 by Vixy 🦊

server-csi/setup.sh

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+#!/bin/bash
+# Setup script for vixy-vision CSI Camera Server
+
+set -e
+
+echo "🦊 Setting up vixy-vision CSI Camera Server..."
+
+# Create virtual environment
+python3 -m venv venv
+source venv/bin/activate
+
+# Install requirements
+pip install --upgrade pip
+pip install -r requirements.txt
+
+# Try to install camera library
+echo "Detecting camera library..."
+if python3 -c "from picamera2 import Picamera2" 2>/dev/null; then
+    echo "✓ picamera2 already installed"
+elif python3 -c "import picamera" 2>/dev/null; then
+    echo "✓ picamera (legacy) already installed"
+else
+    echo "Attempting to install picamera2..."
+    pip install picamera2 2>/dev/null || {
+        echo "picamera2 failed, trying picamera..."
+        pip install picamera 2>/dev/null || {
+            echo "⚠️ No camera library installed. Will use libcamera-still fallback."
+        }
+    }
+fi
+
+# Generate SSL certificates
+if [ ! -d "ssl" ]; then
+    echo "Generating SSL certificates..."
+    mkdir -p ssl
+    openssl req -x509 -newkey rsa:4096 \
+        -keyout ssl/key.pem -out ssl/cert.pem \
+        -days 365 -nodes \
+        -subj "/CN=localhost/O=Vixy Vision CSI/C=US"
+    echo "✓ SSL certificates generated"
+fi
+
+# Create .env if not exists
+if [ ! -f ".env" ]; then
+    echo "Creating .env file..."
+    API_KEY=$(python3 -c "import secrets; print(secrets.token_urlsafe(32))")
+    cat > .env << EOF
+API_KEY=${API_KEY}
+CAMERA_WIDTH=1920
+CAMERA_HEIGHT=1080
+JPEG_QUALITY=85
+CAMERA_ID=garage
+ROTATION=0
+IR_MODE=true
+EOF
+    echo "✓ Created .env with API_KEY: ${API_KEY}"
+    echo "⚠️ Save this API key!"
+fi
+
+echo ""
+echo "✓ Setup complete!"
+echo ""
+echo "To run the server:"
+echo "  source venv/bin/activate"
+echo "  python3 -m uvicorn main:app --host 0.0.0.0 --port 8443 --ssl-keyfile ssl/key.pem --ssl-certfile ssl/cert.pem"