[nix,flake] Moves some container files around. Also updates the flake lock. [synapse] Gets the federation working

system/hosts/mcp/containers/traefik.nix

@@ -44,6 +44,7 @@ in
     ports = [
       "80:80"
       "443:443"
+      "8448:8448"
     ];
     volumes = [
       "/var/run/podman/podman.sock:/var/run/docker.sock:ro"