feat(rotator): multiple rotors of any type, plus a CAT PTT hotkey

Settings -> Rotator is now a list like the amplifiers: add/remove rotors,
mix PstRotator / Rotator Genius / ARCO, and a Rotator Genius can drive both
its ports (one entry = two rotors). The compass gains a rotor selector, and
a per-rotor motorized-antenna flag so the boom/pattern paths show only for
the rotor carrying the Ultrabeam/SteppIR.

Also in this batch: a keyboard PTT hotkey (hold-to-talk or toggle, reusing
the audio PTT method with a CAT fallback), and TCI spot push to the
panadapter with click-to-fill of the callsign.

frontend/src/components/StationControlPanel.tsx

@@ -13,7 +13,7 @@ import { TunerCard } from '@/components/TunerCard';
 import type { TGStatus } from '@/components/TunerGeniusPanel';
 import {
   GetStationDevices, SaveStationDevices, GetStationStatus, StationSetRelay,
-  GetRotatorHeading, RotatorGoTo, RotatorStop,
+  GetRotatorHeading, RotatorGoTo, RotatorStop, SetActiveRotor,
   GetUltrabeamStatus, SetUltrabeamDirection, UltrabeamRetract, MotorSetElement, MotorReadElements,
   ListDenkoviDevices, ListSerialPorts, TestStationDevice,
   GetAmpStatuses, GetFlexState,
@@ -47,7 +47,7 @@ function blankDevice(): Device {
   return { id: '', type: 'webswitch', name: '', host: '', user: '', pass: '', labels: Array(5).fill('') };
 }
 
-type Heading = { enabled: boolean; ok: boolean; azimuth: number };
+type Heading = { enabled: boolean; ok: boolean; azimuth: number; rotors?: string[]; active?: number };
 
 // RotatorWidget shows the configured rotator (Settings → Rotator) right in the
 // Station Control tab: a live compass you can click to turn, a heading readout, a
@@ -82,6 +82,9 @@ function RotatorWidget({ hd, refetch, centerLat, centerLon, bearing, t }: Rotato
           centerLat={centerLat ?? null}
           centerLon={centerLon ?? null}
           rotorEnabled={hd.ok}
+          rotors={hd.rotors}
+          activeRotor={hd.active}
+          onSelectRotor={(i) => { SetActiveRotor(i).then(refetch).catch((e) => setErr(String(e?.message ?? e))); }}
           onGoto={(az) => turn(az)}
         />
         <div className="flex-1 min-w-0 space-y-2">