first commit, i i have no idea what i have done

server/internal/dto/user.go

@@ -0,0 +1,29 @@
+package dto
+
+import "smoop-api/internal/models"
+
+type UserDto struct {
+	ID       uint        `json:"id"`
+	Username string      `json:"username"`
+	Role     models.Role `json:"role"`
+}
+
+type UserRoleDto struct {
+	Role models.Role `json:"role" binding:"required,oneof=admin user"`
+}
+
+// CreateUserDto is used by POST /users/create to create a new user with a role.
+// Role must be one of: "admin" | "user".
+type CreateUserDto struct {
+	Username string `json:"username" binding:"required"`
+	Password string `json:"password" binding:"required"`
+	Role     string `json:"role" binding:"required,oneof=admin user"`
+}
+
+func MapUser(u models.User) UserDto {
+	return UserDto{
+		ID:       u.ID,
+		Username: u.Username,
+		Role:     u.Role,
+	}
+}