started datamodelling papas excel tables

wagfarm-api/models/taxonomy_models.go

@@ -0,0 +1,7 @@
+package models
+
+type Taxonomy struct {
+	ID    uint   `gorm:"primaryKey" json:"id"`
+	Type  string `gorm:"not null;index" json:"type"` // e.g., "unit", "color", etc.
+	Name   string `gorm:"not null;index" json:"name"`  // e.g., "kg", "lb"
+}