feat(lookup): optional QRZ nickname as the logged name

QRZ publishes <nickname> — the name an operator goes BY on the air — and
OpsLog was composing fname + name instead. "Bob" is what belongs in a log;
"Robert J Smith" is what belongs on a licence.

QRZ only, and deliberately so: HamQTH's <nick> already fills the Name field
that way, so the same switch there would toggle a behaviour it has no way to
turn off.

A published nickname is optional, so an empty one falls through to the
registered name. That is the whole point of it being a fallback rather than a
swap, and it is what the test pins — a blank nickname must never blank the
name.

frontend/wailsjs/go/models.ts

@@ -2541,6 +2541,7 @@ export namespace main {
 	    primary: string;
 	    failsafe: string;
 	    download_images: boolean;
+	    qrz_prefer_nickname: boolean;
 	    cache_ttl_days: number;
 	
 	    static createFrom(source: any = {}) {
@@ -2556,6 +2557,7 @@ export namespace main {
 	        this.primary = source["primary"];
 	        this.failsafe = source["failsafe"];
 	        this.download_images = source["download_images"];
+	        this.qrz_prefer_nickname = source["qrz_prefer_nickname"];
 	        this.cache_ttl_days = source["cache_ttl_days"];
 	    }
 	}