Received packets are uploaded before Mesh::onRecvPacket validates them, so
an advert corrupted over the air that still passes the LoRa CRC is published
with a mangled name or location. `set mqtt.advert.verify on` verifies each
received advert's Ed25519 signature (same message layout as Mesh.cpp,
including the 32-byte app-data clamp) and skips publishing failures.
Defaults off so collectors keep seeing RF corruption on the mesh. Dropped
adverts are counted as badsig= in `get mqtt.stats`. Exposed in the web
config Publishing card and persisted as mqtt.advert_verify in prefs JSON.
agessaman
4716410bc2