Source-aware indicator buffer, Livewire cleanup, LWRP channel-number fix

Слиты twelve запросил слияние fix/indicators в master

Created by: ykmn

Summary

  • Source-aware PlayoutBuffer delay: small fixed delay for continuous sources (Icecast/soundcard/Livewire); HLS channels self-size from their own measured playlist segment duration instead of one blanket 12s constant for all HLS channels.
  • Removed Livewire mono/stereo channel-format selection and its "wrong pitch" hint (from code and the channel edit dialog) — the pitch symptom it was diagnosing had a different, already-fixed root cause (1.00.027's sample-rate fix), and standard Livewire is always stereo regardless of the physical source.
  • Consolidated appsettings.json into settings.yaml — single config file. The only load-bearing key (Urls) moved to settings.yaml; the rest were either bootstrap-only (unchanged) or replaced with equivalent hardcoded behavior.
  • Fixed phantom Livewire channels (1-216) flooding the discovered-channels list — LWRP's SRC table can list many never-renamed slots with auto-generated placeholder names ("SRC 1", "PC 12"); now filtered out.
  • Fixed real Livewire channels showing under wrong (too-low) numbers — LWRP's leading SRC <index> isn't always the real channel number (confirmed via the same network's own Advertisement-sourced cache data); now derived from the authoritative RTPA (multicast-address-encoded) field instead.
  • last_seen in config/livewire.yaml is now human-readable (YYYY-MM-DD hh:mm:ss) instead of Unix seconds, with backward-compatible reading of the old format.

Test plan

  • dotnet build both projects clean
  • dotnet test — 213/213 passing (44 new tests across this branch)
  • Live dotnet run smoke-tested against real production channel configs after each change — no exceptions, correct HLS segment measurement, correct Now listening on: http://0.0.0.0:5000 with no appsettings.json present
  • Field confirmation still needed: real Livewire hardware behavior (no AoIP hardware in this dev environment) — channel-number fix verified against previously-cached real Advertisement data from the same network, not a fresh live capture

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