Conflicts:
- api/__init__.py, web/styles.css: keep audio routes/styles and add the
version manager.
- README.md, CHANGELOG.md: take main's released text; this branch's
0922b27 was an earlier alignment of the same v1.57 notes.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01W411Z69FC3em9CzpeQEub5