refactor: remove internal/domain package, move types to correct packages

- ImageID + ContainerID → internal/docker/types.go
- UnparsedURL → internal/service/webhook/types.go
- Delete internal/domain/ entirely
- Update all imports throughout the codebase

internal/service/deploy/export_test.go

@@ -10,7 +10,6 @@ import (
 
 	"git.eeqj.de/sneak/upaas/internal/config"
 	"git.eeqj.de/sneak/upaas/internal/docker"
-	"git.eeqj.de/sneak/upaas/internal/domain"
 	"git.eeqj.de/sneak/upaas/internal/models"
 )
 
@@ -87,7 +86,7 @@ func (svc *Service) GetBuildDirExported(appName string) string {
 func (svc *Service) BuildContainerOptionsExported(
 	ctx context.Context,
 	app *models.App,
-	imageID domain.ImageID,
+	imageID docker.ImageID,
 ) (docker.CreateContainerOptions, error) {
 	return svc.buildContainerOptions(ctx, app, imageID)
 }