## Checklist
Following the previous contribution that added admin-level management of user access tokens (particularly useful for bot/service accounts), this change exposes the created_at field in the API response when listing or retrieving access tokens.
This information is needed to implement token rotation policies for these users — knowing when a token was created allows administrators to identify and revoke stale tokens.
### Tests for Go changes
- I added test coverage for Go changes...
- [X] in their respective `*_test.go` for unit tests.
- [X] `make pr-go` before pushing
### Documentation
- [X] I did not document these changes and I do not expect someone else to do it.
### Release notes
- [X] This change will be noticed by a Forgejo user or admin (feature, bug fix, performance, etc.). I suggest to include a release note for this change.
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## Release notes
<!--URL:https://codeberg.org/forgejo/forgejo-->
- Features
- [PR](https://codeberg.org/forgejo/forgejo/pulls/12620): <!--number 12620 --><!--line 0 --><!--description ZXhwb3NlIGFjY2VzcyB0b2tlbiBjcmVhdGlvbiBkYXRlIGluIEFQSSByZXNwb25zZXM=-->expose access token creation date in API responses<!--description-->
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Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/12620
Reviewed-by: Andreas Ahlenstorf <aahlenst@noreply.codeberg.org>
