add GET delivery count route

backend/internal/delivery/handler.go

@@ -69,6 +69,17 @@ func (h *Handler) GetDeliveries(c *gin.Context) {
 	c.JSON(http.StatusOK, gin.H{"deliveries": deliveries})
 }
 
+// GET /api/deliveries/count
+func (h *Handler) GetDeliveryCount(c *gin.Context) {
+	counts, err := h.queries.GetDeliveryCount(c.Request.Context())
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to get delivery count", "details": err.Error()})
+		return
+	}
+
+	c.JSON(http.StatusOK, gin.H{"counts": counts})
+}
+
 // POST /api/deliveries
 func (h *Handler) CreateDelivery(c *gin.Context) {
 	var req DeliveryRequest = DeliveryRequest{}