Home Assistant addon crashes on startup with NullPointerException in CgroupV2Subsystem (bare-metal cgroupv2 kernel)

## Problem

The CompreFace Home Assistant addon enters a crash loop on startup with the following error:

```
java.lang.NullPointerException: null
at java.base/jdk.internal.platform.cgroupv2.CgroupV2Subsystem.getInstance(CgroupV2Subsystem.java:81)
```

**Environment:** bare-metal x86/NUC running Home Assistant OS with a pure cgroupv2 kernel.

**How to confirm:** In the addon logs (HA → Settings → Add-ons → CompreFace → Log) you'll see `Started FrsApplication` immediately followed by `Application run failed` with the NPE above, repeating in a loop.

## Root Cause

The JVM attempts to read the cgroup hierarchy via `/sys/fs/cgroup/` and `/proc/1/cgroup`. On bare-metal systems with a pure cgroupv2 kernel, this fails with a NullPointerException in `CgroupV2Subsystem.getInstance()`.

## Fix

Two complementary fixes resolve the issue:

1. **`cgroup_fix.so` (LD_PRELOAD)** — a C library that intercepts `open`, `open64`, `openat`, `fopen`, `fopen64` calls for `/proc/1/cgroup` and `/proc/self/cgroup`, returning fake cgroupv1 content (`1:name=systemd:/`)
2. **`-XX:-UseContainerSupport`** in a `java_wrapper` script — disables JVM container detection entirely, preventing `CgroupV2Subsystem` from being instantiated

## Working Solution

I have published a corrected Docker image and full build instructions (Dockerfile, C source, java_wrapper script) here:

👉 https://github.com/mdaraujoGit/compreface-fixed

The fixed image is available at `ghcr.io/mdaraujogit/compreface-fixed:1.1.0` and can be used directly as a drop-in replacement for the original addon image.

## Notes

- Related to issue #1291 (addon not starting in Home Assistant OS)
- Tested on Intel NUC, Home Assistant OS, OpenJDK 11, CompreFace 1.1.0