Add end-to-end support for `docker_registry_image_tag` in preview and deployment queue flows.
- Extend deploy API to accept `pull_request_id` alias and `docker_tag` for preview deploys
- Persist preview-specific Docker tags on `application_previews` and `application_deployment_queues`
- Pass tag through `queue_application_deployment()` and de-duplicate queued jobs by tag
- Update deployment job logic to resolve and use preview Docker tags for dockerimage build packs
- Update Livewire previews UI/state to manage per-preview tags and manual preview/tag inputs
- Add migration for new tag columns and model fillable/casts updates
- Add feature and unit tests covering API behavior and tag resolution
Replace $guarded usage with explicit $fillable arrays across all models.
Sync fillable definitions with current database schema and add tests.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
