fix: building joins

internal/types/shelves.go

@@ -16,7 +16,7 @@ type ShelfLocation struct {
 	Name        string         `gorm:"index:unique" json:"name"`
 	RoomNumber  string         `json:"room_number,omitempty"`
 	Description string         `json:"description,omitempty"`
-	BuildingID  uint64         `json:"-"`
+	BuildingID  uint64         `json:"building_id"`
 	Building    Building       `json:"building,omitempty"`
 	Assets      []Asset        `json:"assets,omitempty"`
 	CreatedAt   time.Time      `json:"created_at"`