Pure refactors with no behavior change, mostly reusing existing helpers
and dropping duplicated or dead code. Net −222 lines.
- Reuse existing helpers instead of inlined copies: `getIssueIndex`,
`NewLabel`, `ToCommitUser`, `GetPackageFileDescriptors`,
`util.SplitTrimSpace`
- Merge copy-pasted blocks in review comment deletion, project deletion
and the pre/post-receive hook templates
- Drop dead code: an error `toStringKeys` never returned, impossible
`bytes.Buffer` write errors, redundant nil-map branches, a `base64`
wrapper
- Use stdlib where it fits: `strings.Cut`, `bytes.IndexAny`,
`cmp.Compare`, `min`/`max`, `slices.Concat`, map lookups instead of key
scans
silverwind
wxiaoguang