tags/meeting_tags existed since migration 0001, completely unused.
Adds upsert_tag/tags_for_meeting (mirroring upsert_participant's
find-or-create pattern) and real set_tags/list_tags implementations.
Extends list_meetings with tag/participant/date filters via a new
MeetingFilter struct, replacing the old query-only signature — the
participant filter matches either a speaker mapped to that participant
or an attendee of the meeting's linked calendar event, since neither
signal alone covers "who was in this meeting." Tags are populated on
Meeting/MeetingListItem/SearchHit via a per-row lookup (N+1, but
meeting counts are small enough that this is simpler than GROUP_CONCAT
string-splitting).
iamdoubz
fc6a2fa0aa