Include granular_scopes in group credentials inventory personal access token list API responses
### Summary
The route of the group credentials inventory API that lists the personal access tokens of a group's enterprise users and service accounts presents each token with `API::Entities::PersonalAccessToken` and no options:
- `GET /groups/:id/manage/personal_access_tokens`
That entity exposes `granular_scopes` only when the token is granular and `options[:with_granular_scopes]` is set. So a fine-grained token is listed with `granular: true` and `scopes: ["granular"]`, and nothing says what the token can access.
`GET /personal_access_tokens` already passes the options from `granular_scopes_options_for`, and so does the rotate route of this same API class (`POST /groups/:id/manage/personal_access_tokens/:id/rotate`, since !260276). The credentials inventory page of the group shows the permissions and access of each fine-grained token ([`ee/app/views/shared/credentials_inventory/personal_access_tokens/_scopes.html.haml:1-20`](https://gitlab.com/gitlab-org/gitlab/-/blob/509b0502d12ceca2865fa6cd666b0c979052c7a1/ee/app/views/shared/credentials_inventory/personal_access_tokens/_scopes.html.haml#L1-20)), so the API is where an Owner cannot read them. !261673 (#633317) fixed the same gap in the two service account token lists.
### Steps to reproduce
The route answers on GitLab.com only, where the group credentials inventory is available.
1. As an enterprise user of the group for whom the `granular_personal_access_tokens` feature flag is enabled, create a fine-grained personal access token, in the UI or through the API, authenticated with a token that has the `api` scope:
```shell
curl --request POST \
--header "PRIVATE-TOKEN: <enterprise_user_token>" \
--header "Content-Type: application/json" \
--data '{"name": "fine-grained", "granular_scopes": [{"access": "all_memberships", "permissions": ["read_job"]}]}' \
--url "https://gitlab.com/api/v4/user/personal_access_tokens"
```
The response of this route includes `granular_scopes`.
1. As an Owner of the group, list the tokens of its enterprise users and service accounts with `GET /groups/:id/manage/personal_access_tokens`.
1. Compare with the credentials inventory page of the group, which lists the same token with its permissions and access.
I found this by reading the code on `master` and checked the response with a request spec, shown under "Relevant logs" below. I have not run these steps on GitLab.com, where I do not own a group with enterprise users.
### Example Project
Not applicable: any group whose enterprise users or service accounts hold a fine-grained token shows it.
### What is the current *bug* behavior?
Each fine-grained token in the list has `granular: true` and `scopes: ["granular"]`, but no `granular_scopes`. The same token is presented with its `granular_scopes` by `GET /personal_access_tokens` and by the rotate route of the same class.
### What is the expected *correct* behavior?
Each fine-grained token in the list has `granular_scopes`, with `project_id` and `group_id` resolved as on the other routes. Tokens that are not fine-grained are presented as they are today, and the route runs no extra query for them.
### Relevant logs and/or screenshots
From a throwaway request spec on `master`: an enterprise user of the group holds a fine-grained token scoped to a project (ID 18 in that run), and an Owner of the group lists the tokens. The route answers for that token:
```plaintext
{"id":300,"name":"fine-grained","revoked":false,"created_at":"2026-10-17T10:37:15.789Z","description":"Token description","scopes":["granular"],"user_id":206,"last_used_at":null,"last_used_ips":[],"active":true,"granular":true,"expires_at":"2026-11-16"}
```
With the route presenting the page with the options `granular_scopes_options_for` returns, the same token carries its scopes (the project's ID was 19 in that run):
```plaintext
{"id":304,"name":"fine-grained","revoked":false,"created_at":"2026-10-17T10:38:46.404Z","description":"Token description","scopes":["granular"],"user_id":210,"last_used_at":null,"last_used_ips":[],"granular_scopes":[{"access":"selected_memberships","permissions":["read_job"],"project_id":19,"group_id":null}],"active":true,"granular":true,"expires_at":"2026-11-16"}
```
### Output of checks
Found on `master` at 509b0502d12ceca2865fa6cd666b0c979052c7a1. I have not reproduced it on GitLab.com.
### Possible fixes
The list route ends with `present paginate(tokens, skip_default_order: true), with: Entities::PersonalAccessToken` and passes no options ([`ee/lib/api/manage/groups.rb:87`](https://gitlab.com/gitlab-org/gitlab/-/blob/509b0502d12ceca2865fa6cd666b0c979052c7a1/ee/lib/api/manage/groups.rb#L87)).
The entity exposes `granular_scopes` only with `options[:with_granular_scopes]` ([`lib/api/entities/personal_access_token.rb:25-27`](https://gitlab.com/gitlab-org/gitlab/-/blob/509b0502d12ceca2865fa6cd666b0c979052c7a1/lib/api/entities/personal_access_token.rb#L25-27)).
The fix is to present the page with `**granular_scopes_options_for(page)`, as `GET /personal_access_tokens` does ([`lib/api/personal_access_tokens.rb:42-45`](https://gitlab.com/gitlab-org/gitlab/-/blob/509b0502d12ceca2865fa6cd666b0c979052c7a1/lib/api/personal_access_tokens.rb#L42-45)) and the rotate route of the same class does ([`ee/lib/api/manage/groups.rb:141-142`](https://gitlab.com/gitlab-org/gitlab/-/blob/509b0502d12ceca2865fa6cd666b0c979052c7a1/ee/lib/api/manage/groups.rb#L141-142)):
```ruby
paginated_tokens = paginate(tokens, skip_default_order: true)
present paginated_tokens, with: Entities::PersonalAccessToken,
**granular_scopes_options_for(paginated_tokens)
```
The class already includes `API::Helpers::PersonalAccessTokensHelpers` ([`ee/lib/api/manage/groups.rb:17`](https://gitlab.com/gitlab-org/gitlab/-/blob/509b0502d12ceca2865fa6cd666b0c979052c7a1/ee/lib/api/manage/groups.rb#L17)), which brings in the helper ([`lib/api/helpers/authz/granular_scopes_helpers.rb:56-69`](https://gitlab.com/gitlab-org/gitlab/-/blob/509b0502d12ceca2865fa6cd666b0c979052c7a1/lib/api/helpers/authz/granular_scopes_helpers.rb#L56-69)). It preloads the scopes and namespaces of the granular tokens on the page. For a page with no granular token it returns no options and runs no query.
The request spec of the route would cover a granular token listed with its `granular_scopes` (with `project_id` for a project scope), a legacy token listed without the key and with no query on the granular scopes tables, and a query count that does not grow with the number of granular tokens. The section of `doc/api/groups.md` would get a history item and the note the service account token lists carry.
I'd like to work on this.
issue
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