ActivityPub user and category outboxes coming soon

<p>Up until today, when you queried a NodeBB user or category's <code>outbox</code>, you would receive an empty <code>OrderedCollection</code>. This was done because the property's inclusion in the actor object was <strong>required</strong>, but it was not immediately apparent in 2024 how many people utilised this property. Thus it was easier to just send the empty outbox and pursue more urgent functionality.</p> <p>While sending that empty outbox has not broken any implementations, but it has come to my attention that a few (read: more than 1) other implementors already do, or plans to, read from an actor outbox for backfill purposes.</p> <p>The upcoming NodeBB v4.10.0 will contain an outbox populated by the contributions by that user or category.</p> <p>Here's how that works...[...]</p>