feat(awards): implement the QRZ.com and Custom confirmation sources

The award editor offered five confirmation sources and Def's own doc comment
named five, but confirmed() had cases for three. "qrzcom" and "custom" fell
through the switch, so ticking either marked nothing as confirmed — the exact
failure the GrantCodes comment in this struct warns about: a checkbox that does
nothing is worse than no checkbox, because it is trusted.

QRZ.com reads qrzcom_qso_download_status, not the upload one: uploading a QSO
is us telling QRZ about it, which confirms nothing.

Custom names a field. Rather than a checkbox per external source, the Def gains
ConfirmField + ConfirmValue: any QSO field or ADIF extras key, and optionally
the comma-separated values that count. That one shape covers the three cases
asked for — the OpsLog card marker (APP_OPSLOG_QSL_RCVD), an arbitrary ADIF
tag, and a tag stamped by an imported club list — because all three end up as a
field on the QSO.

An empty ConfirmValue means any non-empty content confirms: the OpsLog marker
stores the date the card arrived, not a Y/N flag. A custom source naming NO
field confirms nothing, deliberately — the opposite default would silently mark
a whole logbook confirmed.

frontend/src/components/AwardEditor.tsx

@@ -38,6 +38,9 @@ export type AwardDef = {
   or_rules?: AwardOrRule[];
   dxcc_filter: number[] | null; valid_bands?: string[]; valid_modes?: string[]; emission?: string[];
   confirm: string[] | null; validate?: string[] | null; grant_codes?: string; export_credit_granted?: boolean;
+  // The "custom" confirmation source: the field it reads and, optionally, the
+  // value(s) that count. Empty value = any non-empty value confirms.
+  confirm_field?: string; confirm_value?: string;
   total: number; builtin?: boolean; version?: number;
 };
 
@@ -622,6 +625,30 @@ export function AwardEditor({ open, onClose, onSaved }: Props) {
                         ))}
                       </div>
                     </div>
+
+                    {/* "Custom" is only meaningful once it names a field, so the
+                        inputs appear as soon as it is ticked in either column —
+                        and a custom source with no field confirms nothing. */}
+                    {((cur.confirm ?? []).includes('custom') || (cur.validate ?? []).includes('custom')) && (
+                      <div className="space-y-2 border-t border-border/60 pt-3">
+                        <Label className="text-xs font-semibold">{t('awed.customLabel')}</Label>
+                        <div className="grid grid-cols-2 gap-3">
+                          <div className="space-y-1">
+                            <Label className="text-[11px] text-muted-foreground">{t('awed.customField')}</Label>
+                            <Input className="h-8 font-mono text-xs" placeholder="APP_OPSLOG_QSL_RCVD"
+                              value={(cur as any).confirm_field ?? ''}
+                              onChange={(e) => patch({ confirm_field: e.target.value.trim().toUpperCase() } as any)} />
+                          </div>
+                          <div className="space-y-1">
+                            <Label className="text-[11px] text-muted-foreground">{t('awed.customValue')}</Label>
+                            <Input className="h-8 font-mono text-xs" placeholder="Y,V"
+                              value={(cur as any).confirm_value ?? ''}
+                              onChange={(e) => patch({ confirm_value: e.target.value } as any)} />
+                          </div>
+                        </div>
+                        <p className="text-[11px] text-muted-foreground leading-relaxed">{t('awed.customHint')}</p>
+                      </div>
+                    )}
                     {/* "Grant codes" and "export credit_granted" used to live here. No
                         ADIF export has ever written CREDIT_GRANTED, so both controls
                         did nothing at all. The stored values are kept (see award.Def);

frontend/wailsjs/go/models.ts

@@ -325,6 +325,8 @@ export namespace award {
 	    emission?: string[];
 	    confirm: string[];
 	    validate?: string[];
+	    confirm_field?: string;
+	    confirm_value?: string;
 	    grant_codes?: string;
 	    export_credit_granted?: boolean;
 	    total: number;
@@ -367,6 +369,8 @@ export namespace award {
 	        this.emission = source["emission"];
 	        this.confirm = source["confirm"];
 	        this.validate = source["validate"];
+	        this.confirm_field = source["confirm_field"];
+	        this.confirm_value = source["confirm_value"];
 	        this.grant_codes = source["grant_codes"];
 	        this.export_credit_granted = source["export_credit_granted"];
 	        this.total = source["total"];