Removes json tags from User struct as they are unused

internal/model/user.go

@@ -1,7 +1,7 @@
 package model
 
 type User struct {
-	ID        string `json:"id"`
-	FirstName string `json:"firstName" validate:"required"`
-	Email     string `json:"email" validate:"required,email"`
+	ID        string
+	FirstName string
+	Email     string
 }