Returns sites for the authenticated user's auto-group.
By default only active sites are returned (includeInactive=0).
Pass includeInactive=1 to include inactive sites.

Paging (opt-in): send page and/or pageSize to enable Redis snapshot pagination.
Omitting both returns the full unpaged { sites } list (backward compatible).
On the first paged request (no cacheId), the API freezes the ordered ID list in Redis
and returns page metadata plus cacheId. Subsequent pages require that cacheId.
Sessions use a 2-minute sliding TTL with a 10-minute hard max age from create.