feat(clublog): the matches come home, and Club Log lends its call list

Two new QSO columns, clublog_qso_download_status/date — a Club Log MATCH,
the service's own confirmation (both stations uploaded the QSO, paired
within 15 minutes). Full promoted-column lockstep: migration 0031, repo
insert/scan, ADIF dictionary + import + export (app-defined
CLUBLOG_QSO_DOWNLOAD_*), table columns, filter builder, bulk edit and the
QSO editor's Club Log row.

The QSL Manager's Club Log entry now actually downloads: getmatches.php
with the existing account settings and the embedded application key,
incremental via the match-completion date filter, matched call+band+mode
±15 min with a mode-blind fallback because Club Log reports 'false' for
modes it cannot infer. Matches always exist on both sides, so unmatched
ones are listed rather than skeleton-added.

And Super Check Partial can merge Club Log's weekly SCP list (~180k calls
worked on the air in the last 3 years) with MASTER.SCP — an opt-in
checkbox under the SCP setting.

internal/adif/import.go

@@ -287,6 +287,7 @@ var adifPromoted = stringSet(
 	"hrdlog_qso_upload_date", "hrdlog_qso_upload_status",
 	"qrzcom_qso_upload_date", "qrzcom_qso_upload_status",
 	"qrzcom_qso_download_date", "qrzcom_qso_download_status",
+	"clublog_qso_download_date", "clublog_qso_download_status",
 	// Contest
 	"contest_id", "srx", "stx", "srx_string", "stx_string",
 	"check", "precedence", "arrl_sect",
@@ -493,6 +494,8 @@ func recordToQSO(rec Record) (qso.QSO, bool) {
 	q.QRZComUploadStatus = rec["qrzcom_qso_upload_status"]
 	q.QRZComDownloadDate = rec["qrzcom_qso_download_date"]
 	q.QRZComDownloadStatus = rec["qrzcom_qso_download_status"]
+	q.ClublogDownloadDate = rec["clublog_qso_download_date"]
+	q.ClublogDownloadStatus = rec["clublog_qso_download_status"]
 
 	// Contest
 	q.ContestID = rec["contest_id"]