feat(hamlog): read confirmations back from a HAMLOG.online ADIF

Their agent protocol has no download verb, so the return path is a file
exported from their site. Running that file through the ordinary ADIF
import is the wrong tool and does real damage: it matches on callsign +
UTC minute + band + mode, their export is rebuilt from their own
database and rarely agrees to the minute, and 'update duplicates' then
inserts everything that failed to match -- several hundred copies of
contacts already in the log.

This path matches only. It stamps the confirmation on QSOs it finds,
falls back to the mode-CLASS key for the modes their export renames, and
REPORTS what it could not match instead of adding it: an unmatched
confirmation is a question about the log, not a contact to create.

Also logs and reports how many rows a delete actually removed -- silence
there made a delete that did nothing indistinguishable from one that
worked.

internal/award/award.go

@@ -1632,3 +1632,7 @@ func sortedBands(m map[string]int) []string {
 	})
 	return out
 }
+
+// HamlogAltKeys exposes the alternate spellings so a reader outside this package
+// (the confirmations import) accepts exactly what the award engine accepts.
+func HamlogAltKeys() []string { return append([]string(nil), hamlogAltKeys...) }