Support selection of authorization servers from PRM document

[localden]

Initial Checks

• I confirm that I'm using the latest version of MCP Python SDK
• I confirm that I searched for my issue in https://github.com/modelcontextprotocol/python-sdk/issues before opening this issue

Description

SDK should offer a way for developers to specify which of the authorization servers to use from the PRM document.

python-sdk/src/mcp/client/auth.py

Line 250 in 07ae8c0

self.context.auth_server_url = str(metadata.authorization_servers[0])

Right now, the first server is selected.

Example Code

Python & MCP Python SDK

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