refactor: remove domain types package, define types alongside implementations

- Move ImageID and ContainerID to internal/docker package
- Move UnparsedURL to internal/service/webhook package
- Delete internal/domain package entirely
- No more alias imports needed

Addresses review comments on PR #126.

internal/docker/client.go

@@ -26,7 +26,6 @@ import (
 	"go.uber.org/fx"
 
 	"git.eeqj.de/sneak/upaas/internal/config"
-	"git.eeqj.de/sneak/upaas/internal/domain"
 	"git.eeqj.de/sneak/upaas/internal/logger"
 )
 
@@ -43,6 +42,12 @@ const stopTimeoutSeconds = 10
 // alpine/git v2.47.2 - pulled 2025-12-30
 const gitImage = "alpine/git@sha256:d86f367afb53d022acc4377741e7334bc20add161bb10234272b91b459b4b7d8"
 
+// ImageID is a Docker image identifier (ID or tag).
+type ImageID string
+
+// ContainerID is a Docker container identifier.
+type ContainerID string
+
 // ErrNotConnected is returned when Docker client is not connected.
 var ErrNotConnected = errors.New("docker client not connected")
 
@@ -117,7 +122,7 @@ type BuildImageOptions struct {
 func (c *Client) BuildImage(
 	ctx context.Context,
 	opts BuildImageOptions,
-) (domain.ImageID, error) {
+) (ImageID, error) {
 	if c.docker == nil {
 		return "", ErrNotConnected
 	}
@@ -189,7 +194,7 @@ func buildPortConfig(ports []PortMapping) (nat.PortSet, nat.PortMap) {
 func (c *Client) CreateContainer(
 	ctx context.Context,
 	opts CreateContainerOptions,
-) (domain.ContainerID, error) {
+) (ContainerID, error) {
 	if c.docker == nil {
 		return "", ErrNotConnected
 	}
@@ -242,11 +247,11 @@ func (c *Client) CreateContainer(
 		return "", fmt.Errorf("failed to create container: %w", err)
 	}
 
-	return domain.ContainerID(resp.ID), nil
+	return ContainerID(resp.ID), nil
 }
 
 // StartContainer starts a container.
-func (c *Client) StartContainer(ctx context.Context, containerID domain.ContainerID) error {
+func (c *Client) StartContainer(ctx context.Context, containerID ContainerID) error {
 	if c.docker == nil {
 		return ErrNotConnected
 	}
@@ -262,7 +267,7 @@ func (c *Client) StartContainer(ctx context.Context, containerID domain.Containe
 }
 
 // StopContainer stops a container.
-func (c *Client) StopContainer(ctx context.Context, containerID domain.ContainerID) error {
+func (c *Client) StopContainer(ctx context.Context, containerID ContainerID) error {
 	if c.docker == nil {
 		return ErrNotConnected
 	}
@@ -282,7 +287,7 @@ func (c *Client) StopContainer(ctx context.Context, containerID domain.Container
 // RemoveContainer removes a container.
 func (c *Client) RemoveContainer(
 	ctx context.Context,
-	containerID domain.ContainerID,
+	containerID ContainerID,
 	force bool,
 ) error {
 	if c.docker == nil {
@@ -302,7 +307,7 @@ func (c *Client) RemoveContainer(
 // ContainerLogs returns the logs for a container.
 func (c *Client) ContainerLogs(
 	ctx context.Context,
-	containerID domain.ContainerID,
+	containerID ContainerID,
 	tail string,
 ) (string, error) {
 	if c.docker == nil {
@@ -338,7 +343,7 @@ func (c *Client) ContainerLogs(
 // IsContainerRunning checks if a container is running.
 func (c *Client) IsContainerRunning(
 	ctx context.Context,
-	containerID domain.ContainerID,
+	containerID ContainerID,
 ) (bool, error) {
 	if c.docker == nil {
 		return false, ErrNotConnected
@@ -355,7 +360,7 @@ func (c *Client) IsContainerRunning(
 // IsContainerHealthy checks if a container is healthy.
 func (c *Client) IsContainerHealthy(
 	ctx context.Context,
-	containerID domain.ContainerID,
+	containerID ContainerID,
 ) (bool, error) {
 	if c.docker == nil {
 		return false, ErrNotConnected
@@ -379,7 +384,7 @@ const LabelUpaasID = "upaas.id"
 
 // ContainerInfo contains basic information about a container.
 type ContainerInfo struct {
-	ID      domain.ContainerID
+	ID      ContainerID
 	Running bool
 }
 
@@ -414,7 +419,7 @@ func (c *Client) FindContainerByAppID(
 	ctr := containers[0]
 
 	return &ContainerInfo{
-		ID:      domain.ContainerID(ctr.ID),
+		ID:      ContainerID(ctr.ID),
 		Running: ctr.State == "running",
 	}, nil
 }
@@ -483,7 +488,7 @@ func (c *Client) CloneRepo(
 
 // RemoveImage removes a Docker image by ID or tag.
 // It returns nil if the image was successfully removed or does not exist.
-func (c *Client) RemoveImage(ctx context.Context, imageID domain.ImageID) error {
+func (c *Client) RemoveImage(ctx context.Context, imageID ImageID) error {
 	_, err := c.docker.ImageRemove(ctx, string(imageID), image.RemoveOptions{
 		Force:         true,
 		PruneChildren: true,
@@ -498,7 +503,7 @@ func (c *Client) RemoveImage(ctx context.Context, imageID domain.ImageID) error
 func (c *Client) performBuild(
 	ctx context.Context,
 	opts BuildImageOptions,
-) (domain.ImageID, error) {
+) (ImageID, error) {
 	// Create tar archive of build context
 	tarArchive, err := archive.TarWithOptions(opts.ContextDir, &archive.TarOptions{})
 	if err != nil {
@@ -543,7 +548,7 @@ func (c *Client) performBuild(
 			return "", fmt.Errorf("failed to inspect image: %w", inspectErr)
 		}
 
-		return domain.ImageID(inspect.ID), nil
+		return ImageID(inspect.ID), nil
 	}
 
 	return "", nil
@@ -619,7 +624,7 @@ func (c *Client) performClone(ctx context.Context, cfg *cloneConfig) (*CloneResu
 func (c *Client) createGitContainer(
 	ctx context.Context,
 	cfg *cloneConfig,
-) (domain.ContainerID, error) {
+) (ContainerID, error) {
 	gitSSHCmd := "ssh -i /keys/deploy_key -o StrictHostKeyChecking=no"
 
 	// Build the git command using environment variables to avoid shell injection.
@@ -676,10 +681,10 @@ func (c *Client) createGitContainer(
 		return "", fmt.Errorf("failed to create git container: %w", err)
 	}
 
-	return domain.ContainerID(resp.ID), nil
+	return ContainerID(resp.ID), nil
 }
 
-func (c *Client) runGitClone(ctx context.Context, containerID domain.ContainerID) (*CloneResult, error) {
+func (c *Client) runGitClone(ctx context.Context, containerID ContainerID) (*CloneResult, error) {
 	err := c.docker.ContainerStart(ctx, string(containerID), container.StartOptions{})
 	if err != nil {
 		return nil, fmt.Errorf("failed to start git container: %w", err)

internal/domain/types.go

@@ -1,16 +0,0 @@
-// Package domain defines domain-specific string types for compile-time safety.
-// Using named types prevents accidentally passing the wrong string argument
-// (e.g. a container ID where an image ID is expected).
-package domain
-
-// ImageID is a Docker image identifier (ID or tag).
-type ImageID string
-
-// ContainerID is a Docker container identifier.
-type ContainerID string
-
-// UnparsedURL is a URL stored as a plain string without parsing.
-// Use this instead of string when the value is known to be a URL
-// but should not be parsed into a net/url.URL (e.g. webhook URLs,
-// compare URLs from external payloads).
-type UnparsedURL string

internal/service/deploy/deploy.go

@@ -20,7 +20,6 @@ import (
 	"git.eeqj.de/sneak/upaas/internal/config"
 	"git.eeqj.de/sneak/upaas/internal/database"
 	"git.eeqj.de/sneak/upaas/internal/docker"
-	"git.eeqj.de/sneak/upaas/internal/domain"
 	"git.eeqj.de/sneak/upaas/internal/logger"
 	"git.eeqj.de/sneak/upaas/internal/models"
 	"git.eeqj.de/sneak/upaas/internal/service/notify"
@@ -418,7 +417,7 @@ func (svc *Service) executeRollback(
 
 	svc.removeOldContainer(ctx, app, deployment)
 
-	rollbackOpts, err := svc.buildContainerOptions(ctx, app, domain.ImageID(previousImageID))
+	rollbackOpts, err := svc.buildContainerOptions(ctx, app, docker.ImageID(previousImageID))
 	if err != nil {
 		svc.failDeployment(bgCtx, app, deployment, err)
 
@@ -515,7 +514,7 @@ func (svc *Service) buildImageWithTimeout(
 	ctx context.Context,
 	app *models.App,
 	deployment *models.Deployment,
-) (domain.ImageID, error) {
+) (docker.ImageID, error) {
 	buildCtx, cancel := context.WithTimeout(ctx, buildTimeout)
 	defer cancel()
 
@@ -540,7 +539,7 @@ func (svc *Service) deployContainerWithTimeout(
 	ctx context.Context,
 	app *models.App,
 	deployment *models.Deployment,
-	imageID domain.ImageID,
+	imageID docker.ImageID,
 ) error {
 	deployCtx, cancel := context.WithTimeout(ctx, deployTimeout)
 	defer cancel()
@@ -668,7 +667,7 @@ func (svc *Service) checkCancelled(
 	bgCtx context.Context,
 	app *models.App,
 	deployment *models.Deployment,
-	imageID domain.ImageID,
+	imageID docker.ImageID,
 ) error {
 	if !errors.Is(deployCtx.Err(), context.Canceled) {
 		return nil
@@ -688,7 +687,7 @@ func (svc *Service) cleanupCancelledDeploy(
 	ctx context.Context,
 	app *models.App,
 	deployment *models.Deployment,
-	imageID domain.ImageID,
+	imageID docker.ImageID,
 ) {
 	// Clean up the intermediate Docker image if one was built
 	if imageID != "" {
@@ -817,7 +816,7 @@ func (svc *Service) buildImage(
 	ctx context.Context,
 	app *models.App,
 	deployment *models.Deployment,
-) (domain.ImageID, error) {
+) (docker.ImageID, error) {
 	workDir, cleanup, err := svc.cloneRepository(ctx, app, deployment)
 	if err != nil {
 		return "", err
@@ -1017,8 +1016,8 @@ func (svc *Service) createAndStartContainer(
 	ctx context.Context,
 	app *models.App,
 	deployment *models.Deployment,
-	imageID domain.ImageID,
+	imageID docker.ImageID,
-) (domain.ContainerID, error) {
+) (docker.ContainerID, error) {
 	containerOpts, err := svc.buildContainerOptions(ctx, app, imageID)
 	if err != nil {
 		svc.failDeployment(ctx, app, deployment, err)
@@ -1063,7 +1062,7 @@ func (svc *Service) createAndStartContainer(
 func (svc *Service) buildContainerOptions(
 	ctx context.Context,
 	app *models.App,
-	imageID domain.ImageID,
+	imageID docker.ImageID,
 ) (docker.CreateContainerOptions, error) {
 	envVars, err := app.GetEnvVars(ctx)
 	if err != nil {
@@ -1147,7 +1146,7 @@ func buildPortMappings(ports []*models.Port) []docker.PortMapping {
 func (svc *Service) updateAppRunning(
 	ctx context.Context,
 	app *models.App,
-	imageID domain.ImageID,
+	imageID docker.ImageID,
 ) error {
 	app.ImageID = sql.NullString{String: string(imageID), Valid: true}
 	app.Status = models.AppStatusRunning

internal/service/webhook/webhook.go

@@ -11,12 +11,17 @@ import (
 	"go.uber.org/fx"
 
 	"git.eeqj.de/sneak/upaas/internal/database"
-	"git.eeqj.de/sneak/upaas/internal/domain"
 	"git.eeqj.de/sneak/upaas/internal/logger"
 	"git.eeqj.de/sneak/upaas/internal/models"
 	"git.eeqj.de/sneak/upaas/internal/service/deploy"
 )
 
+// UnparsedURL is a URL stored as a plain string without parsing.
+// Use this instead of string when the value is known to be a URL
+// but should not be parsed into a net/url.URL (e.g. webhook URLs,
+// compare URLs from external payloads).
+type UnparsedURL string
+
 // ServiceParams contains dependencies for Service.
 type ServiceParams struct {
 	fx.In
@@ -51,12 +56,12 @@ type GiteaPushPayload struct {
 	Ref        string      `json:"ref"`
 	Before     string      `json:"before"`
 	After      string      `json:"after"`
-	CompareURL domain.UnparsedURL `json:"compare_url"`
+	CompareURL UnparsedURL `json:"compare_url"`
 	Repository struct {
 		FullName string      `json:"full_name"`
-		CloneURL domain.UnparsedURL `json:"clone_url"`
+		CloneURL UnparsedURL `json:"clone_url"`
 		SSHURL   string      `json:"ssh_url"`
-		HTMLURL  domain.UnparsedURL `json:"html_url"`
+		HTMLURL  UnparsedURL `json:"html_url"`
 	} `json:"repository"`
 	Pusher struct {
 		Username string `json:"username"`
@@ -64,7 +69,7 @@ type GiteaPushPayload struct {
 	} `json:"pusher"`
 	Commits []struct {
 		ID      string      `json:"id"`
-		URL     domain.UnparsedURL `json:"url"`
+		URL     UnparsedURL `json:"url"`
 		Message string      `json:"message"`
 		Author  struct {
 			Name  string `json:"name"`
@@ -169,7 +174,7 @@ func extractBranch(ref string) string {
 
 // extractCommitURL extracts the commit URL from the webhook payload.
 // Prefers the URL from the head commit, falls back to constructing from repo URL.
-func extractCommitURL(payload GiteaPushPayload) domain.UnparsedURL {
+func extractCommitURL(payload GiteaPushPayload) UnparsedURL {
 	// Try to find the URL from the head commit (matching After SHA)
 	for _, commit := range payload.Commits {
 		if commit.ID == payload.After && commit.URL != "" {
@@ -179,7 +184,7 @@ func extractCommitURL(payload GiteaPushPayload) domain.UnparsedURL {
 
 	// Fall back to constructing URL from repo HTML URL
 	if payload.Repository.HTMLURL != "" && payload.After != "" {
-		return domain.UnparsedURL(string(payload.Repository.HTMLURL) + "/commit/" + payload.After)
+		return UnparsedURL(string(payload.Repository.HTMLURL) + "/commit/" + payload.After)
 	}
 
 	return ""