fix(client): forward User-Agent through OAuth auth flow#2526

Genmin wants to merge 4 commits intomodelcontextprotocol:mainmodelcontextprotocol/python-sdk:mainfrom

Genmin:fix/streamable-http-auth-user-agent-1664Genmin/python-sdk:fix/streamable-http-auth-user-agent-1664Copy head branch name to clipboard