chore: repoint URLs at git.swaits.com and bump for release

Rewrites remaining github.com / git.sr.ht references to git.swaits.com,
translating GitHub URL shapes to Gitea's (/blob/<ref>/ -> /src/branch/<ref>/,
/tree/<tag> -> /src/tag/<tag>, /actions/workflows/X -> /actions?workflow=X,
/edit/ -> /_edit/).

Left pointing at GitHub on purpose: pull-request links (PRs were not migrated)
and GitHub-only surfaces Gitea lacks (security advisories, discussions).

PERFORMANCE_ANALYSIS.md

@@ -1124,7 +1124,7 @@ Planned additions to benchmark suite:
 
 For questions about benchmark methodology or results:
 
-- Open an issue: https://github.com/swaits/announcement/issues
+- Open an issue: https://git.swaits.com/swaits/announcement/issues
 - Performance discussions: Label with "performance"
 
 ---