fix: restore storage endpoint for smoke test

internal/handler/storage.go

@@ -0,0 +1,20 @@
+package handler
+
+import (
+	"net/http"
+
+	"github.com/gin-gonic/gin"
+
+	"github.com/ShukeBta/MediaStationGo/internal/service"
+)
+
+func storageBreakdownHandler(svc *service.Container) gin.HandlerFunc {
+	return func(c *gin.Context) {
+		breakdown, err := svc.Storage.Compute(c.Request.Context())
+		if err != nil {
+			c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+			return
+		}
+		c.JSON(http.StatusOK, breakdown)
+	}
+}