Sync NWC connections across devices

A connection made on the phone existed only there, so only that device could
answer it — and if that device was asleep, a client just spun. Connections now
ride the encrypted device-sync snapshot, so whichever device is awake can
serve them. The snapshot is nip44-encrypted to a key derived from the seed,
the same channel that already carries ark vtxo bytes and gift secrets.

The merge is a union by id with two rules that matter:
- REVOCATION WINS, so a stale snapshot can never resurrect a revoked
  connection
- the higher same-day spend wins, so a stale device cannot hand a connection
  back its daily budget

Creating or revoking a connection publishes the snapshot immediately rather
than waiting for the next state change.

Co-Authored-By: Claude Fable 5 <[email protected]>

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