A speaker can be reachable, named, and already account-paired yet still
report SOUNDTOUCH_NOT_CONFIGURED, leaving the "install the Bose app"
prompt on screen (reported for ST30 Series II/III in #615). Only a full
pass through the WebSocket setup state machine clears it, but running
that unconditionally risks re-running the bracket on speakers that
don't need or support it.
Add Manager.PreflightInitPlan: checks /supportedURLs for
/setMargeAccount, then requires /soundTouchConfigurationStatus to read
exactly SOUNDTOUCH_NOT_CONFIGURED before ExecuteInitPlan runs.
Already-configured devices are a no-op; an unsupported route or an
unrecognised status value aborts instead of guessing.
Tobias Gesellchen
e57708ea11