Ring members API returns 0 members despite creator being a ring host

## Bug After creating a ring, the members list endpoint returns an empty list even though the creator is recognized as Ring Host. ## Steps to reproduce 1. Create an organization 2. Create a ring within it 3. Navigate to the ring detail page 4. The status badge shows "Ring Host" and a "Leave Ring" button is visible (confirming the user IS a member) 5. But the header shows "0 members" and the Active Members tab shows "No members yet." ## API behavior - `GET /v1/groups/{groupId}` — returns the group with `member_count: 0` - `GET /v1/groups/{groupId}/members?status=active` — returns an empty list - The group detail response does include the correct membership status for the current user (role: host) ## Expected The ring creator should appear in the members list with `member_count: 1` and be shown in the Active Members tab. ## Impact Ring detail page shows contradictory information — user is a host but member count is 0. The ring-membership E2E test correctly catches this.