curiOS v26.02.0

This release updates the system container with several fixes and improvements,
and bumps the underlying Buildroot to v2025.02.11-kkit (BusyBox 1.37.0, and a
lot fo security fixes).

Bug fixes

- System container services not starting at boot — a regression introduced in
  v25.10.0 caused the nftables overlay's simplified inittab to overwrite the
  system container's, silently preventing all init.d service scripts from running.

New features

- Web server in the system container — the system container now ships a
  BusyBox httpd start script and default web content, making it easy to serve
  a status page or simple management UI on port 80 out of the box.
- Version info survives volume mounts — /etc/os-release and /etc/version are
  now symlinks into /usr/lib/, so users who mount a volume over /etc or /var
  to persist configuration will see the correct version string after upgrading
  the container image, rather than the one from first boot.
- Consistent version string — the version string (e.g. v25.10.0-8-gabcdef1) is
  now computed once at build time using git describe, matching how Infix
  handles versioning.

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>