Several handlers skipped checks that their sibling routes or settings already enforce. This brings them in line.
- Push mirror API honors `DISABLE_NEW_PUSH` and checks the caller's permission
- Media API serves small files with the usual content headers
- Issue attachment API ignores comment attachments
- Push-to-create respects `FORCE_PRIVATE`
- Profile feeds and follow actions respect `ENABLE_FEED` and owner visibility
- Tag delete route refuses release tags
- Refresh token grant only accepts refresh tokens
- Gitea migrations bound the source's page size
Co-authored-by: bircni <bircni@icloud.com>