Decouple hub abbreviation from API prefix

README.md

@@ -34,7 +34,7 @@ Set secure MariaDB passwords in `.env`. Then, set at least these values in
 
 ```json
 {
-    "abbr": "api",
+    "abbr": "vtc",
     "name": "Drivers Hub",
     "domain": "hub.example.com",
     "prefix": "/api",
@@ -75,8 +75,9 @@ from `config_sample.json`. Restart the backend after you change
 Use the same database password in `.env` and `config/config.json`.
 Set `domain` to the public host name of the backend. Do not include a protocol or
 path.
-Set `prefix` to `/{abbr}` when you use the official frontend. The
-`client-config` plugin uses this relation to create frontend API URLs.
+Set `abbr` to a short identifier for the VTC. The Docker frontend deployment
+derives the API base URL from its `VITE_CONFIG_URL`, so `abbr` does not have to
+match `prefix`.
 Create an hCaptcha site for the public frontend domain. Set its secret in the
 `captcha.secret` value. Set the related public site key as
 `VITE_HCAPTCHA_SITEKEY` in the frontend deployment.
@@ -86,10 +87,10 @@ backend expects the singular names shown above. This deployment configuration
 enables all built-in plugins by default. Keep `client-config` separate in
 `external_plugins`.
 
-The deployment patch synchronizes the plugin list from `config/config.json` to
-the stored frontend configuration when the backend starts. Other frontend
-settings in MariaDB stay unchanged. Restart the backend after you enable or
-disable a plugin.
+The deployment patch synchronizes `abbr` and the plugin list from
+`config/config.json` to the stored frontend configuration when the backend
+starts. Other frontend settings in MariaDB stay unchanged. Restart the backend
+after you change `abbr` or enable or disable a plugin.
 
 ## Configure external connections