Rename customs-tablet-frontend to public-frontend and add new features

- Rename customs-tablet-frontend/ to public-frontend/ for broader scope
- Add new pages: customs, inspection with camera integration
- Add new services: apiClient.ts, backendApi.ts, normalizers.ts
- Add CameraFrame component for real-time video streaming
- Add scan_fixer module with clock_publisher and timestamp fix utilities
- Update startup scripts to support new frontend structure
- Update arm_server configuration and service files

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

arm_server/arm_server.service

@@ -6,14 +6,13 @@ Wants=network-online.target
 [Service]
 Type=simple
 User=pi
-WorkingDirectory=/home/pi/work/smart-inspection/arm_server
-Environment=PATH=/home/pi/.local/bin:/usr/local/bin:/usr/bin:/bin
+EnvironmentFile=-/etc/default/arm_server
 ExecStartPre=/bin/sleep 5
-ExecStart=/usr/bin/env uv run --locked python arm_server.py
+ExecStart=/bin/bash -lc 'export PATH="$HOME/.local/bin:/usr/local/bin:/usr/bin:/bin:$PATH"; cd "${ARM_SERVER_DIR:-$HOME/work/smart-inspection/arm_server}" && exec uv run --locked python arm_server.py'
 Restart=on-failure
 RestartSec=5
-StandardOutput=append:/home/pi/work/smart-inspection/arm_server/stdout.log
-StandardError=append:/home/pi/work/smart-inspection/arm_server/stderr.log
+StandardOutput=journal
+StandardError=journal
 
 [Install]
 WantedBy=multi-user.target