feat: deployable reference architectures

[Jelledb]

• With STACKIT Sandbox as a first example

[github-actions]

Scorecard Check

No module changes detected relative to origin/main.

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[Copilot]

Pull request overview

Adds support for “importable” (code-shipping) reference architectures, including a first deployable example for a STACKIT Sandbox Landing Zone, and surfaces this capability in the website UI.

Changes:

• Extend reference architecture data model and generator to detect directory-based architectures with meshstack_integration.tf (mark as hasCode + URLs/modulePath).
• Update website list/detail pages to display an “Importable” badge and provide “Add to meshStack” / “View code” actions.
• Add the new deployable reference architecture stackit-sandbox-landingzone with Terraform code + documentation.

Reviewed changes

Copilot reviewed 8 out of 15 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
website/src/app/features/reference-architecture-list/reference-architecture-list.component.ts	Adds hasCode to the list card VM.
website/src/app/features/reference-architecture-list/reference-architecture-list.component.html	Explains “Importable” and shows badge on cards when hasCode is true.
website/src/app/features/reference-architecture-detail/reference-architecture-detail.component.ts	Adds import dialog integration and exposes code-related URLs in the detail VM.
website/src/app/features/reference-architecture-detail/reference-architecture-detail.component.html	Adds “Importable” badge, GitHub source link, and “How to use” actions for code-shipping architectures.
website/src/app/core/reference-architecture.ts	Extends ReferenceArchitecture with hasCode + URLs/modulePath.
reference-architectures/stackit-sandbox-landingzone/README.md	Introduces the STACKIT Sandbox Landing Zone reference architecture documentation.
reference-architectures/stackit-sandbox-landingzone/meshstack_integration.tf	Adds meshStack importable integration for the reference architecture.
reference-architectures/stackit-sandbox-landingzone/buildingblock/*	Provides the Terraform implementation (versions/vars/provider/main/outputs) + README + logo.
index.ts	Updates reference architecture parsing to support directory-based architectures and emit code metadata.

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[tob1aswe1ss]

Its the first time that I've reviewed a meshstack hub PR. We should think about how we can also cover changes via tests or something else because for me it is no longer a dummy app. We've already added quite a few things that need to be tested. For example, the hasCode flag you introduced.