Integrates upstream v1.17.0. Key adaptations:
- companion + repeater NodePrefs moved to upstream's new ConfigSerializer
(prefs.json) format; EastMesh fields (companion wifi, repeater fan and
MQTT bridge peer) appended as serializer groups/keys
- legacy binary prefs loaders retain EastMesh tail fields, so existing
devices migrate their settings to the new format
- companion main.cpp adopts upstream InterfaceManager while keeping
runtime WiFi credentials from prefs
- kept EastMesh release-tag versioning in setup-build-environment action
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
