merge: TCI audio — receive, transmit, and the voice keyer over the CAT link

A SunSDR carries its audio on the same WebSocket as its commands, so
OpsLog can take it directly: no virtual cable, no second sound card, no
Windows mixer between the recording and the air. The radio appears as a
device in both audio lists and can be chosen for either direction.

Everything here was settled on real hardware over one evening, and none of
it was guessable from the documentation:

  - The receive stream answers format=3 for four-byte floats, so the
    sample width is derived from the frame rather than trusted from the
    field.
  - The radio asks for transmit audio only when the transmission is the
    CLIENT'S, and only when its transmit audio source is TCI rather than
    the microphone.
  - The chrono is a REQUEST, not a clock: no payload, carrying the size it
    wants, 47 times a second. Audio goes out in answer to it and never on
    a timer of our own — a timer was the first attempt and all 234 frames
    of it were ignored.

Confirmed: a clean test recording, and 80 W out of a 1 kHz tone.

frontend/wailsjs/go/models.ts

@@ -1210,6 +1210,28 @@ export namespace cat {
 	        this.fixed = source["fixed"];
 	    }
 	}
+	export class TCIAudioStatus {
+	    running: boolean;
+	    sample_rate: number;
+	    frames: number;
+	    samples: number;
+	    peak_db: number;
+	    last_err?: string;
+	
+	    static createFrom(source: any = {}) {
+	        return new TCIAudioStatus(source);
+	    }
+	
+	    constructor(source: any = {}) {
+	        if ('string' === typeof source) source = JSON.parse(source);
+	        this.running = source["running"];
+	        this.sample_rate = source["sample_rate"];
+	        this.frames = source["frames"];
+	        this.samples = source["samples"];
+	        this.peak_db = source["peak_db"];
+	        this.last_err = source["last_err"];
+	    }
+	}
 	export class YaesuTXState {
 	    available: boolean;
 	    model?: string;