docs: add app requirements feature

[Ghaith (Gaitholabi)]

This pull request updates the app registration and manifest documentation to introduce and explain the new "requirements" feature for Shopware apps. It describes how apps can declare requirements in their manifest.xml, how Shopware validates these during installation and updates, and provides details on the available requirements, including the new public-access requirement.

Clarifications and environment-specific behavior:

• Noted that requirements validation is available since Shopware 6.7.10.0, and that validation is skipped in dev and test environments to avoid blocking development and CI.

These changes help app developers understand how to use requirements for more robust app installation and validation.

[Copilot]

Pull request overview

Adds documentation for the new Shopware App “requirements” feature, explaining how to declare requirements in manifest.xml, when Shopware validates them, and documenting the initial public-access requirement.

Changes:

• Add a new manifest snippet showing <requirements> usage.
• Extend the manifest reference with a “Requirements” section and public-access details.
• Extend the app registration/setup guide with a dedicated “Requirements” section, including environment-specific validation behavior.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
snippets/config/app/requirements.xml	New snippet demonstrating the <requirements> manifest element.
resources/references/app-reference/manifest-reference.md	Adds “Requirements” + documents public-access validator behavior.
guides/plugins/apps/app-registration-setup.md	Adds requirements overview, usage example, and notes about validation behavior in prod vs dev/test.

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[Micha Hobert (Isengo1989)]

Thx for the PR Ghaith (@Gaitholabi) 👍

[somethings (lasomethingsomething)]

Thank you Ghaith (@Gaitholabi) -- some small edits

[Micha Hobert (Isengo1989)]

Due to this PR -> #2237 a merge conflict appeared

[Ghaith (Gaitholabi)]

Due to this PR -> #2237 a merge conflict appeared

Done ✔️

[Micha Hobert (Isengo1989)]

Due to this PR -> #2237 a merge conflict appeared

Done ✔️

Almost 🙂 -> 2268cba

Fixed the internal links. Ready to be merged IMO - feel free to do so if you see fit in the timeline of releases/planning 👍

[Ghaith (Gaitholabi)]

Due to this PR -> #2237 a merge conflict appeared

Done ✔️

Almost 🙂 -> 2268cba

Fixed the internal links. Ready to be merged IMO - feel free to do so if you see fit in the timeline of releases/planning 👍

we should be okay to merge from my end, we clearly highlight that it's available since/starting 6.7.10.0

Though I can't merge myself, as I don't have write access to the repository

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