feat: initial commit

internal/domain/apperror/errors.go

@@ -0,0 +1,25 @@
+package apperror
+
+import "errors"
+
+type AppError struct {
+	Code    string
+	Message string
+}
+
+func (e *AppError) Error() string {
+	return e.Message
+}
+
+var (
+	ErrMessageEmpty        = &AppError{Code: "MSG_EMPTY", Message: "message text is empty"}
+	ErrRouteNotFound       = &AppError{Code: "ROUTE_NOT_FOUND", Message: "no route found for message"}
+	ErrWorkflowTimeout     = &AppError{Code: "WORKFLOW_TIMEOUT", Message: "workflow call timed out"}
+	ErrTranscriptionFailed = &AppError{Code: "TRANSCRIPTION_FAILED", Message: "voice transcription failed"}
+	ErrSessionNotFound     = &AppError{Code: "SESSION_NOT_FOUND", Message: "session not found"}
+	ErrDownloadFailed      = &AppError{Code: "DOWNLOAD_FAILED", Message: "file download failed"}
+)
+
+func Is(err, target error) bool {
+	return errors.Is(err, target)
+}