Updates for supporting OfficialRegistry

[slimslenderslacks]

Run

Run official registry servers from the gateway

docker mcp gateway run --mcp-registry http://registry.modelcontextprotocol.io/v0/servers/.....

Import

Import official registry servers into a custom catalog

# create a new named catalog (this already exists - I'm not inventing anything here)
docker mcp catalog create officialregistrystuff

# now import some servers into it
docker mcp catalog import officialregistrystuff --mcp-registry http://registry.modelcontextprotocol.io/v0/servers/...

# now you have to run the gateway with a special flag --use-configured-catalogs (again, this is not new)
docker mcp gateway run --use-configured-catalogs