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

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server-csi/env.example

@@ -0,0 +1,18 @@
+# vixy-vision CSI Camera Configuration
+
+# API Key for authentication (generate with: python3 -c "import secrets; print(secrets.token_urlsafe(32))")
+API_KEY=your-api-key-here
+
+# Camera settings
+CAMERA_WIDTH=1920
+CAMERA_HEIGHT=1080
+JPEG_QUALITY=85
+
+# Camera ID for identification
+CAMERA_ID=garage
+
+# Rotation (0, 90, 180, 270)
+ROTATION=0
+
+# IR camera mode (disables some auto-exposure features)
+IR_MODE=true