Fix: Update authentik Caddy template to use HTTP backend

- Change reverse_proxy from https:// to http:// backend
- Use authentik_http_port instead of authentik_https_port
- Remove unnecessary TLS transport configuration
- Remove health check for non-existent endpoint

This aligns the Ansible template with the working configuration
where authentik only serves HTTP internally and Caddy handles SSL.

roles/valkey/templates/valkey.conf.j2

@@ -40,7 +40,7 @@ tcp-keepalive {{ valkey_tcp_keepalive }}
 # =================================================================
 
 # Require password for all operations
-requirepass {{ valkey_requirepass }}
+requirepass {{ valkey_password }}
 
 # =================================================================
 # Memory Management
@@ -136,4 +136,4 @@ client-output-buffer-limit pubsub 32mb 8mb 60
 # - Database 3+: Future applications
 #
 # Connection example:
-# redis-cli -h {{ valkey_bind }} -p {{ valkey_port }} -a {{ valkey_requirepass }} -n 1
+# redis-cli -h {{ valkey_bind }} -p {{ valkey_port }} -a {{ valkey_password }} -n 1