add some changes

backend/internal/backup/handler.go

@@ -156,6 +156,19 @@ func (h *Handler) ListClients(c *gin.Context) {
 	// Parse search query
 	opts.Search = c.Query("search")
 
+	// Parse category filter
+	if category := c.Query("category"); category != "" {
+		// Validate category
+		validCategories := map[string]bool{
+			"File":     true,
+			"Database": true,
+			"Virtual":  true,
+		}
+		if validCategories[category] {
+			opts.Category = category
+		}
+	}
+
 	clients, err := h.service.ListClients(c.Request.Context(), opts)
 	if err != nil {
 		h.logger.Error("Failed to list clients", "error", err)