feat(cli): select transport in config; server MultiServer + client dial handover
- aura-cli config gains [transport] (order + per-transport ports + obfuscate/
masquerade); server binds all enabled transports via MultiServer, client uses
dial() with UDP->TCP->QUIC handover. Config examples updated; backward-compatible
(defaults to udp,tcp,quic). 21 cli tests incl. a real-UDP-transport loopback.
- docs/sing-box.md: integration approach note (process-bridge now; native Go
outbound for phones, with crypto-library mapping + KAT requirement).
- Normalize rustfmt across the v2 transport files (tcp/dial/udp contract).
Whole workspace: 97 tests pass, clippy -D warnings clean, fmt clean. Deploy flow
(pki init/issue-server/issue-client) validated with the release binary.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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