Use VCSEC broadcasts for Teslemetry vehicle lock

[Bre77]

Breaking change

Proposed change

Reroute the vehicle lock to its VCSEC lock-state broadcast when the vehicle is
BLE paired, reusing the BLE data manager's connection-generation availability.
Lock/unlock commands still route through the existing command router, and the
charge cable latch stays on the stream. An unrecognized lock enum resolves to
unavailable.

This stacks on #978 (its base branch), part of the series moving cheapest-source
vehicle values onto the local Bluetooth link.

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