add user management functionality with OTP verification and consent handling, DI introduced

internal/api/auth/domain/auth_domain.go

@@ -0,0 +1,51 @@
+package domain
+
+import "context"
+
+type AuthRepository interface {
+	SaveOtpRequest(ctx context.Context, uuid string, code string) error
+	GetOtpRequest(ctx context.Context, uuid string) (*string, error)
+}
+
+type ErrOtpNotFound struct {
+	Uuid string
+}
+
+func (e ErrOtpNotFound) Error() string {
+	return "OTP request not found for UUID: " + e.Uuid
+}
+
+type ErrUserNotFound struct {
+	PhoneNumber string
+}
+
+func (e ErrUserNotFound) Error() string {
+	return "User not found with phone number: " + e.PhoneNumber
+}
+
+type ErrOtpInvalid struct {
+	Code string
+	Uuid string
+}
+
+func (e ErrOtpInvalid) Error() string {
+	return "Invalid OTP code: " + e.Code + " for UUID: " + e.Uuid
+}
+
+type ErrInvalidHydraAccept struct {
+	Message string
+	Uuid    string
+}
+
+func (e ErrInvalidHydraAccept) Error() string {
+	return "Invalid Hydra accept request: " + e.Message + " for UUID: " + e.Uuid
+}
+
+type ErrInvalidPhoneNumber struct {
+	PhoneNumber string
+	Err         error
+}
+
+func (e ErrInvalidPhoneNumber) Error() string {
+	return "Invalid phone number: " + e.PhoneNumber + ", error: " + e.Err.Error()
+}