FDM v2.8.8

feat(2.8.8): torrent DHT persistence + live peer counts

- Enable rqbit DHT persistence (drop --disable-dht-persistence) so the routing
  table is cached between runs — faster peer discovery for magnets instead of a
  cold DHT bootstrap every launch.
- Surface live peer counts: rqbit peer_stats.live → TStats.peers → NativeHandles
  → JobStatus.peers → UI. The dock shows "Connecting… · N peers" (or "· N peers"
  once downloading), and the Transfers table shows "Connecting…" for a torrent
  still resolving metadata plus a Peers stat in the info panel — so a dead/
  unseeded torrent reads clearly instead of a misleading "Downloading 0%".

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>