Store all team-related app-data in a team-folder

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Feature request

We should pull all team-related data together and store it in a consolidated team-folder assigned to the team.

Directory structure

For team-related resources, a hidden directory called .system should be created in the team folder by default, where sub-folders for Collectives, Deck, etc. live in.
The rest of the team-folder could be used and managed by the team-members

Example

<Team>
	.system
		Collectives
		Deck
		Talk
	Userfolder 1
	Userfolder 2
	Textfile.odt

Note: This represents the frontend path visible to the user. On disk, the path is actually

<Team-folder-ID>/files/.system/

Use case

• At the moment, several Apps create their own directory structure inside the Nextcloud data folder. These folders get linked/mounted to the users home directory, leading to confusion and misuse of those.
• More tidy, clear directory structure
• Quota and permissions could more easily be controlled if data is in one place

The issue specifies a team-folder layout with a hidden .system directory and the on-disk path /files/.system/, but names no implementation files or tests. Start by tracing the current team-related storage paths and reviewing closed pull request #5011. Done means the listed team data is consolidated there while user-managed files remain available in the team folder.