feat: Add Raspberry Pi webcam capture and upload demo with install/uninstall scripts, config, and README.

demo/uninstall.sh

@@ -0,0 +1,29 @@
+#!/bin/bash
+# uninstall.sh - Remove PicUpper cron job
+
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+CAPTURE_SCRIPT="${SCRIPT_DIR}/capture-upload.sh"
+
+echo "=== PicUpper Uninstaller ==="
+echo ""
+
+# Remove cron job
+if crontab -l 2>/dev/null | grep -q "$CAPTURE_SCRIPT"; then
+    crontab -l | grep -v "$CAPTURE_SCRIPT" | crontab -
+    echo "✓ Cron job removed"
+else
+    echo "⚠ No cron job found"
+fi
+
+echo ""
+echo "Uninstall complete."
+echo ""
+echo "Note: Log file and configuration are preserved."
+echo "  Config: ${SCRIPT_DIR}/picupper.conf"
+echo "  Logs:   /var/log/picupper.log"
+echo ""
+echo "To completely remove, also delete:"
+echo "  rm -rf ${SCRIPT_DIR}"
+echo "  sudo rm /var/log/picupper.log"