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

server/internal/dto/auth.go

@@ -0,0 +1,20 @@
+package dto
+
+type AuthDto struct {
+	Username string `json:"username" binding:"required"`
+	Password string `json:"password" binding:"required"`
+}
+
+type AccessTokenDto struct {
+	AccessToken string `json:"accessToken"`
+}
+
+type ChangePasswordDto struct {
+	UserID      uint   `json:"userId,omitempty"`
+	OldPassword string `json:"oldPassword"`
+	NewPassword string `json:"newPassword" binding:"required"`
+}
+
+type CheckTokenResultDto struct {
+	IsValid bool `json:"isValid"`
+}