- Add site_zto.py: ZTO expected-arrival data download with menu
navigation, export polling, and Excel merge
- Wire ZTO into main_router: site URL, login detection, menu items
[5]/[6], and a global offline Left Anti-Join compare entry [9]
- Read config.yaml debug flags to launch only the target site for
focused debugging; guard each site init and route handler behind
site-loaded checks via is_site_ready()
- Expand config.example.yaml with documented debug, baishi, and zto
config keys
Co-Authored-By: Claude <noreply@anthropic.com>
