Promote storeSyncConf from StoreServiceConf to a top-level WakuConf
field so relay/full nodes can run RBSR reconciliation + transfer
without mounting the store service. When no store service is present,
back the sync protocols with a small archive (default sqlite://:memory:,
hidden --store-sync-db-url override) bounded by a time:2*range retention
policy. Drive the ENR Sync capability bit from the new top-level conf so
full nodes discover each other for reconciliation.
Existing CLI flags are unchanged; store-service nodes keep identical
behavior, including --storenode sync-peer slotting (standalone nodes
warn instead, so sync peer selection stays discovery-based and is not
pinned to one store peer).
Part of the "Store as a startup-only dependency" experiment (step 1).
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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