Prevent login loops when the WebUI is protected by HTTP authentication
at a reverse proxy. Apply the fix to settings, uploads, and live streams
while retaining compatibility with existing WebUI clients.
Fixes#523
Require explicit acknowledgement whenever operators enable TRACE and keep its active state visible until they restore normal logging.\n\nAdd an authenticated browser download for the complete retained logging snapshot, including runtime context and clear privacy guidance, while preserving the existing filtered-view export and memory-only TRACE boundary.\n\nCover the transition, snapshot, formatting, download, and client contracts with focused regression tests.
DrSmoothl