Changelog for Altworx 26.16.0

Building Altworx outside Docker now requires cmake. brod 4.5 pulls in crc32cer 1.x, which builds its NIF with cmake instead of a plain Makefile, and there is no fallback when the NIF fails to load. It is already installed in the Dockerfile, the exdoc image, the dev container and the CI job, so only local builds outside Docker need it added.

AI Assistant: Add the conversation engine app (PR, #7950)
REST: support multiple SSO providers of the same type (PR, #8000)
Update dependencies, including fixes for security advisories in mint, tesla, cowlib, cowboy, plug_cowboy, hpax, decimal, swoosh and mdex (PR, #8022)
REST: remove the legacy SSO API (PR, #8003)
Admin UI: Fix race condition on the restart page (PR)