Hide cron wrapper logs from logs listing

Only show per-run gniza-*.log files in the logs page. Cron wrapper
logs (cron-*.log) are redundant with the structured per-run logs
and just accumulate noise. They remain accessible via direct URL.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

whm/gniza-whm/logs.cgi

@@ -52,7 +52,7 @@ sub show_list {
     my @files;
     if (opendir my $dh, $log_dir) {
         while (my $entry = readdir $dh) {
-            next unless _valid_log_filename($entry);
+            next unless $entry =~ /^gniza-\d{8}-\d{6}\.log$/;
             my $path = "$log_dir/$entry";
             next unless -f $path;
             my @stat = stat($path);
@@ -61,7 +61,7 @@ sub show_list {
                 name   => $entry,
                 size   => $stat[7] // 0,
                 mtime  => $stat[9] // 0,
-                type   => ($entry =~ /^cron-/) ? 'Cron' : _detect_log_type($path),
+                type   => _detect_log_type($path),
                 status => $status,
             };
         }