GH-818 Chunked Responses Review 1

[dnwiebe]

Note

Refactors routing/return-route handling by embedding IDs in Route, consolidating per-stream state in ProxyServer, simplifying APIs (no separate return-route messages), and updating neighborhood/route structures, utilities, and tests accordingly.

• Core routing/protocol:
  • Embed return-route IDs in Route (set_return_route_id, return_route_id); remove separate ID passing.
  • ExpectedServices::RoundTrip no longer carries an ID; add hostname_opt to RouteQueryResponse.
  • Remove AddReturnRouteMessage; eliminate related plumbing.
• ProxyServer:
  • Introduce StreamInfo map to track tunneled_host, DNS-retry, route, protocol, TTL; generate per-request return-route IDs; retire old maps.
  • Rework DNS failure handling, retries, and stream key purge scheduling; logging tweaks.
• Neighborhood/Route:
  • Adjust zero-hop and multi-hop route responses to new shapes; propagate hostname.
  • Update ExpectedService helpers (accessors for keys/wallets/rates).
• Utilities:
  • TtlHashMap: add retire-closure and remove; timing/cleanup changes.
  • StreamKey::make_meaningless_stream_key now random.
  • Rename HTTP framer logger to HttpPacketFramer.
• Tests/fixtures:
  • Widespread updates removing return_route_id parameters, adding stream_key, and aligning with new APIs and behaviors.
  • Minor cleanups (e.g., string/port handling) and .gitignore tweak.

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[dnwiebe]

Resume at proxy_server.rs:3258 green