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/requirements.txt

@@ -0,0 +1,13 @@
+# vixy-vision CSI Camera Server Requirements
+
+# Web framework
+fastapi>=0.100.0
+uvicorn[standard]>=0.22.0
+
+# Config
+python-dotenv>=1.0.0
+
+# Camera libraries (install what's appropriate for your Pi):
+# For Pi OS Bookworm/Bullseye (Pi 4/5): pip install picamera2
+# For older Raspbian (Pi 3): pip install picamera
+# Or use libcamera-still/raspistill command fallback (no pip needed)