fix(start-test): suprima erorile ONNX thread affinity in LXC

OMP_NUM_THREADS=1 previne incercarea ONNX de a seta pthread affinity,
care esua cu EINVAL in containere LXC.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

start-test.sh

@@ -12,6 +12,8 @@
 set -euo pipefail
 cd "$(dirname "$0")"
 
+export OMP_NUM_THREADS=1
+
 if [ $# -eq 0 ]; then
     exec ./start.sh test both --send
 fi