Create a timeline or wall collection with all user's posts

See https://www.stevebate.net/a-box-is-not-a-timeline/

For inbox and outbox ?

Easy to do with ActivityPods, but ideally we should propose a FEP so that it becomes a standard.

Could be an alternative to https://github.com/assemblee-virtuelle/mastopod/issues/2

No files, tests, or PRs are linked. Start by finding where Mastopod currently serves user inbox/outbox or timeline-like data (API route and collection logic) in the repository, then inspect those model/serializer files. Review any ActivityPods-related integration code and issue #2 for prior context. Done means the issue becomes a concrete proposal for a user timeline/wall collection with clear scope and implementation approach.

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