v0.8.3

Added

• set_scopes(device_url, scopes) — replace the device's scope list
• set_system_date_and_time(device_url, req) — set device clock;
  takes SetDateTimeRequest (manual or NTP, UTC offset, datetime fields)
• Both methods covered by handlers in examples/mock_server.rs
• Both methods demonstrated in examples/write_workflow.rs

Fixed

• Broken intra-doc links in events.rs, imaging.rs, types/device.rs,
  types/recording.rs, client/mod.rs — resolves red version badge on lib.rs

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