fix(changelog): add #9632 fragment and fix #9415 fragment well-formedness

- Add changelog fragment for PR #9632: connection test status preserved on network error + OAuth timeout reclassification
- Fix invalid YAML-frontmatter format in #9415 fragment (check:changelog-integrity requires markdown bullet) and

Co-Authored-By: diegosouzapw <diegosouzapw@users.noreply.github.com>

changelog.d/fixes/9632-connection-test-network-error-status.md

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+- **fix(api):** keep the stored connection `testStatus` when a test never reaches the upstream — a `network_error` diagnosis (request timed out locally or aborted) no longer overwrites the stored status; the error fields are still recorded so the attempt is visible. Also fixes a second gap where `classifyFailure` matched `"timeout"` as a substring but `testOAuthConnection` reports its own abort as `Test timed out after 30s` (no `"timeout"` in that string), so an OAuth probe that hit the 30s ceiling was misclassified as `upstream_error` rather than `network_error`. ([#9623](https://github.com/diegosouzapw/OmniRoute/issues/9623)) — thanks @HouMinXi