v0.8.1

Fixed

• README: project structure updated to reflect client/ module directory
  (was incorrectly shown as client.rs); added missing types/audio.rs,
  types/osd.rs, types/ptz_config.rs, examples/write_workflow.rs
• README: running examples list now includes all 29 commands (13 were missing)
• README: removed residual OnvifSession-over-OnvifClient bias
  (// recommended: comment, session.client() description)
• examples/mock_server.rs: fixed axum 0.8 wildcard route syntax
  (/*path → /{*path})

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