feat: Umami/ntfy 可观测性栈与 WordPress AdSense 部署

deploy/router/README.md

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+# Audience router
+
+`nomadro.com` is split by audience:
+
+| Audience | Destination |
+| --- | --- |
+| Chinese users (`nomadro_route=zh`, via language/timezone sniff) | Next.js `:4003` |
+| English users / default | WordPress `:8088` |
+| Googlebot / AdsBot / other crawlers | WordPress (AdSense English surface) |
+
+First HTML visit without a cookie gets a same-origin sniff page that sets `nomadro_route` and reloads.
+
+Detection matches `is-china-user` language + timezone signals (any Chinese language in `navigator.languages` counts).
+
+Router listens on `127.0.0.1:4403`.
+
+## Deploy
+
+```bash
+python deploy/router/deploy_router.py
+```
+
+Or on server:
+
+```bash
+cd /var/www/nomadro-router
+npm install --omit=dev
+cp nomadro-router.service /etc/systemd/system/
+systemctl enable --now nomadro-router
+cp /path/to/Caddyfile /etc/caddy/Caddyfile
+systemctl reload caddy
+```