Add profile inheritance definition support

internal/profile/filesystem_repository.go

@@ -127,12 +127,11 @@ func loadProfile(ctx context.Context, fsys fs.FS, root string, id string) (*doma
 		if prof.ID != id {
 			continue
 		}
-		prof.BackendID = strings.TrimSpace(prof.BackendID)
 		prof.ExtraParams, err = jsonvalue.CopyMap(prof.ExtraParams)
 		if err != nil {
 			return nil, fmt.Errorf("%w: %s: %v", ErrInvalidProfile, relPath, err)
 		}
-		if err := normalizeAndValidateProfile(prof); err != nil {
+		if err := NormalizeAndValidateDefinition(prof); err != nil {
 			if errors.Is(err, ErrRawAPIKeyNotAllowed) {
 				return nil, fmt.Errorf("%w: %s", err, relPath)
 			}
@@ -255,30 +254,3 @@ func requireYAMLStreamEnd(decoder *yaml.Decoder) error {
 	}
 	return errors.New("profile file must contain exactly one YAML document")
 }
-
-func normalizeAndValidateProfile(p *domain.ExecutionProfile) error {
-	if strings.TrimSpace(p.ID) == "" {
-		return errors.New("id is required")
-	}
-	p.Endpoint = strings.TrimSpace(p.Endpoint)
-	if strings.TrimSpace(p.BackendID) == "" && p.Endpoint == "" {
-		return errors.New("backend or endpoint is required")
-	}
-	if p.Endpoint != "" {
-		endpoint, err := domain.NormalizeOpenAICompatibleBaseEndpoint(p.Endpoint)
-		if err != nil {
-			return err
-		}
-		p.Endpoint = endpoint
-	}
-	if strings.TrimSpace(p.Model) == "" {
-		return errors.New("model is required")
-	}
-
-	return domain.ValidateExecutionTargetSettings(domain.ExecutionTarget{
-		Temperature:    p.Temperature,
-		MaxTokens:      p.MaxTokens,
-		TopP:           p.TopP,
-		TimeoutSeconds: p.TimeoutSeconds,
-	})
-}