feat: Super Check Partial + N+1 helper; fix Flex binding to SmartSDR CAT; telemetry callsign wait

- SCP/N+1: new internal/scp downloads the community MASTER.SCP master list and a
  docked two-column widget shows, as you type a call, the known calls containing it
  (Partial) and the calls one edit away (N+1) — click to fix a busted call. Opt-in
  in Settings → General; top-bar toggle; queried debounced on callsign input.
- Flex: OpsLog's GUI-client detection was too loose and could bind to "SmartSDR CAT"
  (or DAX) — both carry "smartsdr" in the program name — instead of the real GUI
  client, making SmartSDR CAT drop and reconnect in a loop while OpsLog was open.
  Now it binds only to a real SmartSDR/Maestro GUI client (e.g. a FLEX-8600M's
  integrated screen) and excludes cat/dax; dropped the risky empty-program fallback.
- Telemetry: on a fresh install the callsign isn't set at launch, so the once-a-day
  heartbeat recorded the machine UUID. Now it waits (~10 min) for the operator to
  enter their callsign before sending, falling back to the UUID only if none appears.

frontend/wailsjs/go/models.ts

@@ -2720,6 +2720,22 @@ export namespace main {
 	        this.com_port = source["com_port"];
 	    }
 	}
+	export class ScpStatus {
+	    enabled: boolean;
+	    count: number;
+	    updated?: string;
+	
+	    static createFrom(source: any = {}) {
+	        return new ScpStatus(source);
+	    }
+	
+	    constructor(source: any = {}) {
+	        if ('string' === typeof source) source = JSON.parse(source);
+	        this.enabled = source["enabled"];
+	        this.count = source["count"];
+	        this.updated = source["updated"];
+	    }
+	}
 	export class SecretStatus {
 	    has_passphrase: boolean;
 	    unlocked: boolean;
@@ -4323,6 +4339,25 @@ export namespace qso {
 
 }
 
+export namespace scp {
+	
+	export class Result {
+	    partial: string[];
+	    nplus1: string[];
+	
+	    static createFrom(source: any = {}) {
+	        return new Result(source);
+	    }
+	
+	    constructor(source: any = {}) {
+	        if ('string' === typeof source) source = JSON.parse(source);
+	        this.partial = source["partial"];
+	        this.nplus1 = source["nplus1"];
+	    }
+	}
+
+}
+
 export namespace solar {
 	
 	export class Data {