Implement warehouse/lot pricing updates and configurator performance fixes

internal/handlers/pricelist.go

@@ -45,8 +45,15 @@ func (h *PricelistHandler) List(c *gin.Context) {
 		return
 	}
 
-	// If offline (empty list), fallback to local pricelists
-	if total == 0 && h.localDB != nil {
+	isOffline := false
+	if v, ok := c.Get("is_offline"); ok {
+		if b, ok := v.(bool); ok {
+			isOffline = b
+		}
+	}
+
+	// Fallback to local pricelists only in explicit offline mode.
+	if isOffline && total == 0 && h.localDB != nil {
 		localPLs, err := h.localDB.GetLocalPricelists()
 		if err == nil && len(localPLs) > 0 {
 			if source != "" {
@@ -338,6 +345,26 @@ func (h *PricelistHandler) GetItems(c *gin.Context) {
 	})
 }
 
+func (h *PricelistHandler) GetLotNames(c *gin.Context) {
+	idStr := c.Param("id")
+	id, err := strconv.ParseUint(idStr, 10, 32)
+	if err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid pricelist ID"})
+		return
+	}
+
+	lotNames, err := h.service.GetLotNames(uint(id))
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+		return
+	}
+
+	c.JSON(http.StatusOK, gin.H{
+		"lot_names": lotNames,
+		"total":     len(lotNames),
+	})
+}
+
 // CanWrite returns whether the current user can create pricelists
 func (h *PricelistHandler) CanWrite(c *gin.Context) {
 	canWrite, debugInfo := h.service.CanWriteDebug()