[hefftich]

Summary

Enable the Team Activity integration to include file activity from group
folders assigned to a team, including its dedicated team folder.

• Implement the optional Team Activity resource provider interface.
• Resolve group folder resource IDs to unique root filecache IDs and expose them as file activity scopes.
• Include the root file ID when retrieving a team's dedicated folder.

• Resolves:
  Show activity of team in Teams app circles#2692

Depends:
nextcloud/server#65347.
CI currently fails because the required OCP APIs are not yet available in server master.

• Relates:
  Add Team Activity resource provider and TeamFolder root fi… server#65347
  Add activity and resource integration circles#3030
  Add Team activity stream activity#3024
  Add Deck resources to Team Activity deck#8516

🤖 AI (if applicable)

• The content of this PR was partly or fully generated using AI (GPT-6.1 Sol)

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