docs: note Caddy v2.11.2 tested; minimum remains v2.5.1

forward_auth syntax is unchanged between 2.5.1 and 2.11.2.

https://claude.ai/code/session_012eTokAaGiZo7aGt1T2W9BC

README.md

@@ -65,7 +65,7 @@ authelia-stack/
 - Caddy already running, in Docker, joined to an external network named
   `caddy_net`. If your network is named differently, replace `caddy_net`
   everywhere in this repo.
-- Caddy v2.5.1 or newer (needed for the `forward_auth` directive).
+- Caddy v2.5.1 or newer (for the `forward_auth` directive; tested on v2.11.2).
 - A root domain you control. DNS A records for `auth.<root>` and every
   protected subdomain must point at the Caddy host's public IP.
 

caddy/Caddyfile

@@ -16,7 +16,7 @@
 #   192.168.x.x     -> real upstream LAN IPs
 #
 # Requirements:
-#   - Caddy v2.5.1+ (for `forward_auth` directive)
+#   - Caddy v2.5.1+ (for `forward_auth` directive; tested on v2.11.2)
 #   - Caddy must be on the `caddy_net` Docker network so it can resolve
 #     `authelia` by container name. In your Caddy compose:
 #       networks: [caddy_net]