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.

internal/cat/tci.go

@@ -28,6 +28,12 @@ type TCI struct {
 	digitalDefault string // surfaced when the rig reports a digital mode (FT8/…)
 	spotsEnabled   bool   // mirror cluster spots onto the TCI panorama
 
+	// OnSpotClick is called when the user clicks one of our spots on the TCI
+	// panorama (callsign + freq), so the host can fill the entry form. Set before
+	// Connect. Mirrors the FlexRadio panadapter-click flow.
+	OnSpotClick   func(callsign string, freqHz int64)
+	unhandledSeen map[string]bool // log each unknown TCI message type once
+
 	mu         sync.Mutex // guards conn + writes + state
 	conn       *websocket.Conn
 	dialCancel context.CancelFunc // cancels an in-flight Connect dial (Interrupt/Stop)
@@ -294,6 +300,32 @@ func (t *TCI) handle(msg string) {
 		if get(0) == "0" {
 			t.tx = get(1) == "true"
 		}
+	default:
+		lname := strings.ToLower(name)
+		// A click on one of our panorama spots comes back as a "spot…" message.
+		// The exact shape isn't well documented, so read a callsign (+ freq) from
+		// any spot-related message and fire the callback. The log line lets us pin
+		// the real format against a radio if it differs.
+		if strings.HasPrefix(lname, "spot") {
+			debugLog.Printf("TCI: spot event: %s", msg)
+			call := get(0)
+			hz, _ := strconv.ParseInt(get(2), 10, 64)
+			if call != "" && t.OnSpotClick != nil {
+				cb := t.OnSpotClick
+				go cb(call, hz)
+			}
+			return
+		}
+		// Log every OTHER unknown message TYPE once, so the protocol (incl. any
+		// spot-click notification named differently) is discoverable from the log
+		// without flooding it with the frequent streamed messages.
+		if t.unhandledSeen == nil {
+			t.unhandledSeen = map[string]bool{}
+		}
+		if !t.unhandledSeen[lname] {
+			t.unhandledSeen[lname] = true
+			debugLog.Printf("TCI: (unhandled once) %s", msg)
+		}
 	}
 }