feat(tor): proxy-aware DesktopHttpClient + relay connection wiring
Phase 3: Network plumbing for Tor-routed relay connections.
DesktopHttpClient refactored from static singleton to Tor-aware class:
- Dual client: direct (30s timeouts) + SOCKS proxy (60s, 2x multiplier)
- Per-relay routing: localhost=direct, .onion=proxy, others via evaluator
- Shared ConnectionPool across client rebuilds
- Companion getSimpleHttpClient() for backward compat (NIP-46 bunker)
DesktopRelayConnectionManager now takes DesktopHttpClient instance.
Main.kt wires TorManager → DesktopHttpClient → RelayManager.
Tests: 10 new DesktopHttpClientTest cases covering Tor on/off,
.onion routing, localhost bypass, timeout multipliers.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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