fix: show actual timestamps in debug log viewer

The Naplóviewer was showing relative times like '3586mp' (seconds ago)
which were also negative due to timezone mismatch — parseLine used
time.Parse (UTC) but log.LstdFlags outputs local time. Now:
- parseLine uses time.ParseInLocation with time.Local
- fmtTime JS shows absolute HH:MM:SS (or MM-DD HH:MM:SS for old entries)

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

controller/internal/web/logbuffer.go

@@ -111,8 +111,9 @@ func parseLine(line string) LogEntry {
 	}
 
 	// Try to parse timestamp: "2006/01/02 15:04:05"
+	// Use Local timezone because Go's log.LstdFlags outputs in local time.
 	if len(line) >= 19 {
-		if t, err := time.Parse("2006/01/02 15:04:05", line[:19]); err == nil {
+		if t, err := time.ParseInLocation("2006/01/02 15:04:05", line[:19], time.Local); err == nil {
 			entry.Timestamp = t
 			rest := line[19:]
 			if len(rest) > 0 && rest[0] == ' ' {