Use PORT as proxyless host port

docker/.env.example

@@ -34,14 +34,11 @@ DB_NAME=synapsis
 # OPTIONAL: General Settings
 # ===========================================
 
-# Application port - 'auto' scans 3000-3020 for first available (recommended)
-# Or set a specific port: PORT=3000
+# Application port.
+# Default install (with bundled Caddy): PORT=auto scans 3000-3020 automatically.
+# Existing reverse proxy mode (PROXY=none): use a fixed localhost port, e.g. PORT=3000.
 PORT=auto
 
-# External reverse proxy mode only:
-# Port on localhost to expose Synapsis for nginx/Traefik/Caddy
-# APP_HOST_PORT=3000
-
 # Allow localhost domains in production (set only for local testing)
 # ALLOW_LOCALHOST=1