Adds, per node, how many distinct FLOOD adverts it originated in the
last 7 days. Zero-hop adverts (route_type DIRECT) are excluded, so a
nearby observer hearing a node's cheap local adverts does not inflate
the number - the existing advert_count mixes both kinds and cannot tell
a chatty flooder (mesh-wide airtime) from
the recommended 240-minute zero-hop cadence (local only).
Consumers (the ArcScope repeater advisor) rate advert hygiene against
the community practice of one flood advert every ~49h; with the mixed
total, a correctly configured repeater looked chatty whenever an
observer sat within zero-hop range.
Implemented like the relay-liveness fields: a pure, unit-tested counter
over (first_seen, route_type, hash) entries with the same timestamp
parsing and hash dedup, fed by a from_pubkey-indexed query capped at the
2000 most recent advert rows. The flood route-type constant is named
advertRouteTypeFlood so this merges independently
of the open unscoped-relay PR (#1823).
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Co-authored-by: Waydroid Builder <build@waydroid.local>
