feat: add /settings command and document /history for UI-command parity

- Add /settings command handler with inline settings keyboard
- Add /history to README commands table
- Update /help command list
- Remove unused Leagu.go old reference

internal/handler/settings.go

@@ -21,9 +21,21 @@ func (h *Handler) handleStart(ctx context.Context, msg *models.Message, user *do
 	h.sendWithKB(ctx, msg.Chat.ID, h.buildStatusText(user), kb)
 }
 
+func (h *Handler) handleSettings(ctx context.Context, msg *models.Message, user *domain.User) {
+	st, err := h.Repo.GetOrCreateSettings(user.ID)
+	if err != nil {
+		h.sendText(ctx, msg.Chat.ID, "Error loading settings")
+		return
+	}
+	bt := h.getTodayBreakThreshold(user)
+	text, kb := h.buildSettingsKeyboard(user, st, bt)
+	h.sendWithKB(ctx, msg.Chat.ID, text, kb)
+}
+
 func (h *Handler) handleHelp(ctx context.Context, msg *models.Message) {
 	text := `Commands:
 /start - Show main menu
+/settings - Open settings
 /clockin - Clock in
 /clockout - Clock out
 /worktype - Select work type