Fold the coinos opt-out into a single Data source picker

Replace the Esplora|Electrum backend toggle plus the separate 'Instant
notifications' on/off with one 'Data source' selector:
  • coinos (instant)  — default; explorer data + coinos push
  • Block explorer     — REST + polling, nothing sent to coinos (the opt-out)
  • Electrum server    — one WS server for data + push (your node / public)

Picking a non-coinos source IS the privacy opt-out, so the standalone toggle is
gone. A single 'mode' setting drives getBackend()/getRealtimeEnabled(), so the
wallet/wsUrl logic is unchanged; existing per-feature settings migrate in
(realtime=off → explorer, backend=electrum → electrum). coinos⇄explorer just
flips the watcher (no rescan); to/from electrum rebuilds the backend.

Sets up cleanly for a future coinos Fulcrum: 'coinos' mode upgrades from
REST+watcher to a full Electrum backend transparently.

Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>

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