Support flexible base paths and thin proxies

docs/deploy-titan.md

@@ -17,6 +17,7 @@ cp .env.example .env
 ```
 
 Edit `/root/compose/aishare/.env` and set `AISHARE_ADMIN_TOKEN`.
+Keep `AISHARE_BASE_PATH=/aishare` for the legacy `xcel.me/aishare` endpoint.
 
 Start:
 
@@ -55,3 +56,27 @@ Reload nginx:
 nginx -t
 docker exec nginx nginx -s reload
 ```
+
+## Proxying From Other Hosts Or Paths
+
+The app does not require a fixed hostname. Reader pages use relative links, and the admin UI derives API and share URLs from the browser's current URL.
+
+For direct serving, set the app mount explicitly:
+
+```env
+AISHARE_BASE_PATH=/
+```
+
+or:
+
+```env
+AISHARE_BASE_PATH=/services/aishare
+```
+
+For thin proxy servers that should forward to this origin, use the compose stack in [`../proxy`](../proxy). It can expose URLs such as:
+
+- `https://aishare.domain.com/`
+- `https://domain.com/services/aishare/`
+- `https://xcel.me/aishare/`
+
+while forwarding to an origin such as `https://x1.xcel.me/aishare/`.