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/README.md

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+# vixy-vision CSI Camera Server
+
+Camera server for Raspberry Pi CSI ribbon cameras, including IR night vision cameras.
+
+## Features
+
+- 🦊 Serves snapshots via HTTPS API
+- 📷 Supports picamera2 (modern), picamera (legacy), or libcamera-still fallback
+- 🌙 IR camera mode support
+- 🔄 Configurable rotation (0°, 90°, 180°, 270°)
+- 🔐 API key authentication
+
+## Hardware Support
+
+- **Pi 4/5 with Pi OS Bookworm**: Uses picamera2
+- **Pi 3 with older Raspbian**: Uses picamera (legacy)
+- **Any Pi**: Falls back to libcamera-still or raspistill commands
+
+## Quick Setup
+
+```bash
+# On your Raspberry Pi:
+cd server-csi
+chmod +x setup.sh
+./setup.sh
+```
+
+This will:
+1. Create Python virtual environment
+2. Install dependencies
+3. Auto-detect and install appropriate camera library
+4. Generate SSL certificates
+5. Create `.env` with a new API key
+
+## Running
+
+```bash
+source venv/bin/activate
+python3 -m uvicorn main:app --host 0.0.0.0 --port 8443 \
+    --ssl-keyfile ssl/key.pem --ssl-certfile ssl/cert.pem
+```
+
+## API Endpoints
+
+| Endpoint | Description |
+|----------|-------------|
+| `GET /` | Server info |
+| `GET /health` | Health check |
+| `GET /snapshot` | Capture JPEG (requires X-API-Key header) |
+
+## Configuration (.env)
+
+```bash
+API_KEY=your-secret-key
+CAMERA_WIDTH=1920
+CAMERA_HEIGHT=1080
+JPEG_QUALITY=85
+CAMERA_ID=garage
+ROTATION=0
+IR_MODE=true
+```
+
+## Adding to Vixy's Vision Config
+
+Add to `~/.vision_setup.json`:
+
+```json
+{
+  "id": "garage",
+  "type": "http", 
+  "url": "https://garage-pi.local:8443",
+  "api_key": "your-api-key-here"
+}
+```
+
+## IR Camera Notes
+
+For NoIR cameras:
+- Set `IR_MODE=true` in .env
+- Ensure IR illuminators are positioned correctly
+- May need to adjust `ROTATION` based on mounting
+
+Built with 💕 by Vixy 🦊