Mohammadreza Khani a9584ab940 feat: implement M3 — UDP/TCP DNS listener ...

- Add DnsListener that binds UDP and TCP on configurable port
- Add [dns] config section with listen address (default 0.0.0.0:5353)
- DNS over TCP uses 2-byte length prefix (RFC 1035 §4.2.2)
- Forward queries through existing DoH pipeline
- Start DNS listener as background task alongside DoH server

2026-07-06 17:57:04 +03:30

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