feat(admin): link the UCP exposure settings to the user documentation

[Timo (taltholtmann)]

1. Why is this change necessary?

The UCP Exposure sub-tab explains each capability and transport only in a one-line tooltip and offers no way to read on.

2. What does this change do, exactly?

Adds a link below the capability and transport checkboxes that opens the UCP section of the Agentic Commerce user docs in a new tab. The URL comes from the snippets, so the German administration links to the German docs page. Both the Meteor (6.6+) and the legacy (6.5) template render it.

3. Describe each step to reproduce the issue or behaviour.

1. Open a Storefront or Headless sales channel › Agentic Commerce › Exposure.
2. The link is shown below the checkboxes and opens the docs in the admin language.

4. Please link to the relevant issues (if any).

• relates Add documentation link for agentic commerce sales channel tab settings shopware#20023

5. Checklist

• I have written tests and verified that they fail without my change
• I have updated developer-facing release notes if this change is relevant for external developers (CHANGELOG.md / CHANGELOG_de-DE.md)
• I have written or adjusted the documentation and agent skills according to my changes
• This change has comments for package types, values, functions, and non-obvious lines of code
• I have read the contribution requirements and fulfilled them

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