feat(cat): Andromeda/G2 front panel support (serial, LED indicators)

Bidirectional Apache Labs Andromeda/G2 front-panel protocol on top of CAT.
Panel logic lives in dedicated units; existing files get only thin hooks.

New units:
- AndromedaMap.pas   — data only: action enums + default button/encoder
  layout tables and LED (ZZZI) numbers (mirroring the Thetis defaults)
- AndromedaPanel.pas — TAndromedaPanel: inbound panel events -> controller
  actions (marshalled via Invoke), state subscription -> ZZZI push via SendProc

Hooks:
- CATEngine: parse ZZZD/ZZZU/ZZZE/ZZZP/ZZZS into generic TCATContext callbacks
- CATAdapter: creates the panel, routes engine callbacks to it, supplies the
  SendProc to the Andromeda port, AddStateListener, ZZZS handshake
- CATSerial: Andromeda flag in port config + HasAndromeda/SendToAndromeda
- RadioController: AddStateListener (multicast, does not steal MainForm's
  OnStateChanged)
- Settings/SettingsForm/MainForm: CATSerialAndromeda[0..3] + persistence + checkbox

First version: serial transport, hardcoded default mapping, LED indicators
(MOX/Tune/CTUN/VFO A-B/Split/NB/NR/SNB/ANF/Squelch). Doc: doc/ANDROMEDA.md.

TODO: default button mapping does not match the physical panel (hardcoded) —
to be fixed later; also ZZMF/LCD text, TCP G2V2 transport, configurable mapping.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

RadioController.pas

@@ -127,6 +127,7 @@ type
   private
     FOnInvoke:       TUIInvokeEvent;
     FOnStateChanged: TRadioStateEvent;
+    FStateListeners: array of TRadioStateEvent;  // доп. наблюдатели (CAT/Andromeda), помимо FOnStateChanged (MainForm)
     FOnAfterTune:    TThreadMethod;   // пост-тюн хук: канал-оркестрация после SetVfoA
     FOnAudioConsume: TAudioConsumeEvent;  // web-перехват RX-аудио (если активен клиент)
     FLocalAudio:     Boolean;   // локальный звук (динамик/мик ПК): GUI=True, демон=False
@@ -577,6 +578,9 @@ type
     // ---- События наружу ----
     property OnInvoke: TUIInvokeEvent read FOnInvoke write FOnInvoke;
     property OnStateChanged: TRadioStateEvent read FOnStateChanged write FOnStateChanged;
+    // Доп. наблюдатели состояния (помимо единственного OnStateChanged, который
+    // занимает MainForm). Нужны CAT/Andromeda для push индикаторов панели.
+    procedure AddStateListener(L: TRadioStateEvent);
     // Пост-тюн хук: вызывается в КОНЦЕ SetVfoA (после Changed(rfVfoA), т.е. вне
     // рендера) — сюда вешается канальная оркестрация (ChannelController.OnVfoTuned),
     // чтобы любой путь тюнинга (desktop/web/CAT/энкодер) был канал-aware headless.
@@ -676,8 +680,18 @@ begin
 end;
 
 procedure TRadioController.Changed(Field: TRadioField);
+var i: Integer;
 begin
   if Assigned(FOnStateChanged) then FOnStateChanged(Self, Field);
+  for i := 0 to High(FStateListeners) do
+    if Assigned(FStateListeners[i]) then FStateListeners[i](Self, Field);
+end;
+
+procedure TRadioController.AddStateListener(L: TRadioStateEvent);
+begin
+  if not Assigned(L) then Exit;
+  SetLength(FStateListeners, Length(FStateListeners) + 1);
+  FStateListeners[High(FStateListeners)] := L;
 end;
 
 procedure TRadioController.PushNetworkState;