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.

frontend/src/components/QSOEditModal.tsx

@@ -71,7 +71,7 @@ const CONFIRMATIONS: ConfDef[] = [
   { key: 'LOTW',    label: 'LoTW',        sent: 'lotw_sent', rcvd: 'lotw_rcvd', sentDate: 'lotw_sent_date', rcvdDate: 'lotw_rcvd_date' },
   { key: 'EQSL',    label: 'eQSL',        sent: 'eqsl_sent', rcvd: 'eqsl_rcvd', sentDate: 'eqsl_sent_date', rcvdDate: 'eqsl_rcvd_date' },
   { key: 'QRZCOM',  label: 'QRZ.com',     sent: 'qrzcom_qso_upload_status' as any, sentDate: 'qrzcom_qso_upload_date' as any, rcvd: 'qrzcom_qso_download_status' as any, rcvdDate: 'qrzcom_qso_download_date' as any },
-  { key: 'CLUBLOG', label: 'Club Log',    sent: 'clublog_qso_upload_status' as any, sentDate: 'clublog_qso_upload_date' as any },
+  { key: 'CLUBLOG', label: 'Club Log',    sent: 'clublog_qso_upload_status' as any, sentDate: 'clublog_qso_upload_date' as any, rcvd: 'clublog_qso_download_status' as any, rcvdDate: 'clublog_qso_download_date' as any },
   { key: 'HRDLOG',  label: 'HRDLog',      sent: 'hrdlog_qso_upload_status' as any, sentDate: 'hrdlog_qso_upload_date' as any },
 ];
 // i18n label keys for confirmation channels whose label has translatable words