feat!: remove a relay immediately instead of unpublishing it

Removing a relay now takes effect immediately:

- the profile stops fetching and advertising it,

- secondary devices immediately apply the removal through the transport sync,

Upgrading removes unpublished relays and triggers keyupdates.

BREAKING CHANGE: set_transport_unpublished() is removed: UIs call delete_transport() when the user removes a relay.

BREAKING CHANGE: list_transports_ex() and the TransportListEntry type are removed: use list_transports().

BREAKING CHANGE: delete_transport() no longer refuses to remove the primary transport: it refuses only to remove the last one and re-elects the sending transport as needed.

BREAKING CHANGE: TransportsModified is now also emitted on the device modifying the transports, not only on devices applying the synced change.

Deprecated: DC_STR_PHASING_OUT

src/scheduler.rs

@@ -325,9 +325,6 @@ struct SchedBox {
 
     /// IMAP loop task handle.
     handle: task::JoinHandle<()>,
-
-    /// Relay published status.
-    is_published: bool,
 }
 
 /// Job and connection scheduler.
@@ -680,9 +677,7 @@ impl Scheduler {
         let mut inboxes = Vec::new();
         let mut start_recvs = Vec::new();
 
-        for (transport_id, configured_login_param, is_published) in
-            ConfiguredLoginParam::load_all(ctx).await?
-        {
+        for (transport_id, configured_login_param) in ConfiguredLoginParam::load_all(ctx).await? {
             let (conn_state, inbox_handlers) =
                 ImapConnectionState::new(ctx, transport_id, configured_login_param.clone()).await?;
             let (inbox_start_send, inbox_start_recv) = oneshot::channel();
@@ -699,7 +694,6 @@ impl Scheduler {
                 folder,
                 conn_state,
                 handle,
-                is_published,
             };
             inboxes.push(inbox);
             start_recvs.push(inbox_start_recv);