Fix Linux .deb runtime crashes and source build on Ubuntu 22.04/24.04/26.04

[stytim]

Problem

The prebuilt Linux .deb ran fine on Ubuntu 22.04 (the CI build target) but crashed on launch on a clean Ubuntu 24.04/26.04, and building from source failed. Root-caused on a clean Ubuntu 26.04 box; one Linux build now serves 22.04/24.04/26.04 (no separate 26.04 build needed).

Runtime crashes (.deb) — three latent bugs that 22.04 masked

1. libOpenGL.so.0 missing — the binary links GLVND's libOpenGL.so.0, but the package only Depends-ed on libgl1 → error while loading shared libraries: libOpenGL.so.0. Now depends on libopengl0.
2. Bundled libs unreachable + incomplete — patchelf ran only on the binary, but RUNPATH $ORIGIN does not propagate to a library's own dependencies, and the name allow-list missed libprotobuf. So libopencv_core→libtbb.so.2 and libopencv_dnn→libprotobuf.so.23 weren't found, and those sonames don't exist on 24/26 (libtbb.so.2→.so.12). Now bundles the dependency closure of the RealSense+OpenCV libs and sets $ORIGIN on every bundled .so.
3. ImGui GL loader dlopen("libGL.so") — the dev-only symlink, absent on runtime-only machines → Failed to initialize OpenGL loader! → abort. Now tries libGL.so.1 first (Linux/GLX branch only; macOS/Windows untouched). This affected every clean Linux box, not just 26.04.

Also: ship the RealSense udev rules (non-root camera access — otherwise "No RealSense devices found") and the app icon; Depends widened to the host GL/GTK/X11/runtime/USB stack (names resolve on 24/26 via the t64 Provides).

Source build

• Add libx11-dev/libxext-dev — find_package(X11) aborted configure on 26.04.
• librealsense apt repo falls back to noble when the running codename isn't served (Intel returns 403 for resolute/oracular/plucky).
• -march=native is now opt-in via -DIRTRACK_NATIVE_ARCH=ON; the distributed binary targets a portable x86-64 baseline (avoids SIGILL on CPUs older than the CI runner).
• README documents the Ubuntu 22.04/24.04/26.04 build recipe.

Verification (on a clean Ubuntu 26.04)

• Ran the patched binary → reaches its GUI loop, no crash (was an instant libOpenGL.so.0 crash).
• Reproduced the new packaging end-to-end → bundles exactly the private compute libs (no GTK/GL contamination); built a valid .deb with dpkg-deb (Depends, postinst/postrm, icon, udev rules all correct).
• All sources pass GCC-15 -fsyntax-only; CMake configures through RealSense + OpenCV; both workflows pass bash -n and YAML validation.
• Adversarial multi-lens review: 0 confirmed defects; its low-severity hardening was applied (nullglob, retry + 403/404-only codename fallback, libudev1/zlib1g in Depends, icon-cache refresh).

Note: an in-place .deb upgrade may need the camera replugged once for the new udev rules to take effect.

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