chore(docker): Change Redis port from 6379 to 6380

Avoid port conflicts with Gitea (or other services) when both run on same server.
Container port remains 6379, host binding changed to 6380.
Updated REDIS_URL in .env.example. Update your local .env and server .env accordingly.

docker-compose.yaml

@@ -56,7 +56,7 @@ services:
     volumes:
       - redis_data:/data
     ports:
-      - '127.0.0.1:6379:6379'
+      - '127.0.0.1:6380:6379'
 
 volumes:
   storage_data: