fix(invites): read RSVPs through zone changes, not a zone query

[MrJarnould]

Proposed change

InvitesService.rsvps(event) raises for every event you host. It works only for events shared
with you.

It issues a per-zone records/query, and an event's own zone rejects that:

{
  "serverErrorCode" : "BAD_REQUEST",
  "reason" : "syncToken operations supported only in SyncZone"
}

Against a live account, before:

private  My cool event        participants=1  -> InvitesApiError: Bad Request (400)
private  My Test Event        participants=4  -> InvitesApiError: Bad Request (400)
private  pyicloud test …      participants=2  -> InvitesApiError: Bad Request (400)
shared   Test event           participants=2  -> 2 rsvp(s)

Shared events work because their zones are owned elsewhere; your own event zones do not
support being queried at all.

The changes feed does support them — it is the same mechanism #339 introduced for enumerating
the shared scope, and a per-zone changes call returns an event's EventDetails, RSVP and
cloudkit.share records together. rsvps() now reads that and filters to RSVP.

Two details:

• desiredRecordTypes asks Apple for the RSVP records alone, and the filter is kept anyway,
  because a projection is a request rather than a guarantee.
• Paging comes free from iter_changes(), which fix(invites): read the shared scope zone by zone #339 already added and which follows the sync
  token to the end.

Not a regression from #339. This path dates from #246. It was simply unreachable while
events() raised on every account — nobody got far enough to call rsvps().

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New service (thank you!)
• New feature (which adds functionality to an existing service)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests
• Documentation or code sample

Additional information

• This PR fixes or closes issue: InvitesService.rsvps() fails for events you host: per-zone query rejected by CloudKit #350
• This PR is related to issue: fix(invites): read the shared scope zone by zone #339, whose mechanism this reuses

Cut from main, touching only pyicloud/services/invites/service.py and
tests/test_invites.py.

Testing. 936 tests pass on Python 3.10, 3.11, 3.12, 3.13 and 3.14, run locally. Three are
new and one existing test was rewritten onto the new mechanism — its fixture records are the
same shape a changes page returns, so it still describes what Apple sends. Four fail against
main.

Verified live across both scopes, which is the part that matters here, since the whole bug
is a difference between them:

private  Test event           -> 1 rsvp(s)   ['Jacob Arnould']
private  My cool event        -> 1 rsvp(s)   ['Jacob Arnould']
private  My Test Event        -> 2 rsvp(s)   ['Jacob Arnould', 'Mrjarnould']
private  pyicloud test …      -> 2 rsvp(s)   ['Jacob Arnould', 'mrjarnould']
shared   Test event           -> 2 rsvp(s)   ['Jacob Arnould', <guest>]

The shared event returns the same two responses as before, so the path that already worked is
unchanged.

How I found it. While building cancel() and publish() (#351), checking which events had
no guests before testing a write against one. Names in the output above are redacted where they
belong to someone else.

Checklist

• The code change is tested and works locally.
• Local tests pass. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.
• Tests have been added to verify that the new code works.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated to README

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📥 Commits

Reviewing files that changed from the base of the PR and between 86c4bc9 and 2f1260c.

📒 Files selected for processing (2)

• pyicloud/services/invites/service.py
• tests/test_invites.py

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