Make create session return type pythonic

[Equlnox]

Note

Change create_session to return a ToolRouterSession object (dot and dict-style access) instead of a TypedDict.

• Tool Router:
  • Replace ToolRouterSession TypedDict with a SimpleNamespace-based object supporting both session.session_id/session.url and session['session_id']/session['url'] access; update usage examples accordingly.

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