onvif-dashboard install-video put MediaMTX in ./bin relative to where it
was run, but start launches the server from inside the package, so the
app looked for it there and reported it missing. serverEnvironment() now
settles CAMERAS_DATA_DIR and CAMERAS_BIN_DIR while still in the user's
directory, and start passes them on. Checked from an installed tarball:
MediaMTX in ./bin is found and the video bridge comes up.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>