Add nvidia-bug-report.sh to ISO and fix GPU diagnostic pack in bee-tui

- build-nvidia-module.sh: extract nvidia-bug-report.sh from .run installer
- build.sh: copy nvidia-bug-report.sh into overlay/usr/local/bin/
- bee-tui: pass --output directly to nvidia-bug-report.sh so log goes
  into the run_dir archive instead of CWD; remove redundant cp step

GPU diagnostic pack in TUI (System acceptance tests → GPU NVIDIA → Run command pack):
  nvidia-smi -q, dmidecode -t baseboard, dmidecode -t system, nvidia-bug-report.sh
All logs archived to /var/log/bee-sat/gpu-nvidia-<ts>.tar.gz

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

iso/builder/build-nvidia-module.sh

@@ -103,6 +103,7 @@ for ko in "$CACHE_DIR/modules/"*.ko; do
 done
 
 cp "$EXTRACT_DIR/nvidia-smi"         "$CACHE_DIR/bin/"
+cp "$EXTRACT_DIR/nvidia-bug-report.sh" "$CACHE_DIR/bin/" 2>/dev/null || true
 cp "$EXTRACT_DIR/libnvidia-ml.so."*  "$CACHE_DIR/lib/" 2>/dev/null || true
 # libcuda stub needed by nvidia-smi at runtime
 cp "$EXTRACT_DIR/libcuda.so."*       "$CACHE_DIR/lib/" 2>/dev/null || true