feat: show Anonymous in league when name empty, add username to settings, show salary hint in summary

internal/bot/league.go

@@ -40,6 +40,9 @@ func (h *Handler) buildLeagueText(orderBy LeagueSortOption) string {
 	for i, e := range entries {
 		rank := i + 1
 		name := e.Username
+		if name == "" {
+			name = "Anonymous"
+		}
 		b.WriteString(fmt.Sprintf("%d  %s\n", rank, name))
 		b.WriteString(fmt.Sprintf("    XP:%d  Lv:%d  S:%d  %.1fh\n", e.XP, e.Level, e.Streak, e.TotalHours))
 	}