This PR changes the URL format for `/compare/` links in the RSS/Atom feeds to include the full domain. This makes the links consistent with all other URLs in the feeds.
Fixes#10168.
I tested this on a local Forgejo build with a sample org and a dummy repository as per the original issue. I then fetched the feed to check:
```bash
$ curl http://localhost:3000/helloworld.atom | grep compare
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 4194 0 4194 0 0 297k <id>10: ed4090ecc2...412413fd40</id>
0 -- <link href="ed4090ecc2...412413fd40" rel="alternate"></link>
```
## Checklist
### AI Disclosure
I used AI to
* ask it how to run a single integration test locally because I didn't know about `make test-sqlite#XXX`.
### Tests
- I added test coverage for Go changes...
- [ ] in their respective `*_test.go` for unit tests.
- [ ] in the `tests/integration` directory if it involves interactions with a live Forgejo server.
- I added test coverage for JavaScript changes...
- [ ] in `web_src/js/*.test.js` if it can be unit tested.
- [ ] in `tests/e2e/*.test.e2e.js` if it requires interactions with a live Forgejo server (see also the [developer guide for JavaScript testing](https://codeberg.org/forgejo/forgejo/src/branch/forgejo/tests/e2e/README.md#end-to-end-tests)).
### Documentation
- [ ] I created a pull request [to the documentation](https://codeberg.org/forgejo/docs) to explain to Forgejo users how to use this change.
- [x] I did not document these changes and I do not expect someone else to do it.
### Release notes
- [ ] 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.
- [x] This change is not visible to a Forgejo user or admin (refactor, dependency upgrade, etc.). I think there is no need to add a release note for this change.
*The decision if the pull request will be shown in the release notes is up to the mergers / release team.*
The content of the `release-notes/<pull request number>.md` file will serve as the basis for the release notes. If the file does not exist, the title of the pull request will be used instead.
Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/10933
Reviewed-by: Mathieu Fenniak <mfenniak@noreply.codeberg.org>
Co-authored-by: xrstf <git@xrstf.de>
Co-committed-by: xrstf <git@xrstf.de>
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