feat: SPE Expert amplifier control (serial/TCP) — OPERATE toggle + live status

Implements the SPE Application Programmer's Guide protocol: packets
0x55 0x55 0x55|CNT|DATA|CHK (sum%256), OPERATE key 0x0D (toggles STANDBY/OPERATE)
and STATUS request 0x90 whose 0xAA-framed reply is a 19-field CSV (mode, RX/TX,
band, power level, output W, SWR, V/I, temp, warnings, alarms). internal/spe
polls status ~1/s over USB serial (go.bug.st/serial, 8N1) or TCP (RS232-to-
Ethernet bridge) — same codec, different transport.

Wired via startPGXL (starts the SPE client for spe* types), bindings GetSPEStatus
/ SPESetOperate, and a live status card + OPERATE/STANDBY toggle in the Amplifier
settings panel. Only the two example-anchored commands are sent (safe); other
keystroke codes were ambiguous in the guide's table. Untested on hardware.

frontend/wailsjs/go/models.ts

@@ -4108,6 +4108,53 @@ export namespace solar {
 
 }
 
+export namespace spe {
+	
+	export class Status {
+	    connected: boolean;
+	    last_error?: string;
+	    model?: string;
+	    operate: boolean;
+	    tx: boolean;
+	    input?: string;
+	    band?: string;
+	    power_level?: string;
+	    output_w: number;
+	    swr_atu: number;
+	    swr_ant: number;
+	    volt_pa: number;
+	    curr_pa: number;
+	    temp_c: number;
+	    warnings?: string;
+	    alarms?: string;
+	
+	    static createFrom(source: any = {}) {
+	        return new Status(source);
+	    }
+	
+	    constructor(source: any = {}) {
+	        if ('string' === typeof source) source = JSON.parse(source);
+	        this.connected = source["connected"];
+	        this.last_error = source["last_error"];
+	        this.model = source["model"];
+	        this.operate = source["operate"];
+	        this.tx = source["tx"];
+	        this.input = source["input"];
+	        this.band = source["band"];
+	        this.power_level = source["power_level"];
+	        this.output_w = source["output_w"];
+	        this.swr_atu = source["swr_atu"];
+	        this.swr_ant = source["swr_ant"];
+	        this.volt_pa = source["volt_pa"];
+	        this.curr_pa = source["curr_pa"];
+	        this.temp_c = source["temp_c"];
+	        this.warnings = source["warnings"];
+	        this.alarms = source["alarms"];
+	    }
+	}
+
+}
+
 export namespace udp {
 	
 	export class Config {