Fix SAA: set CWD=/usr/local/bin; include all SAA package binaries

- saa_dmi.go: set cmd.Dir=/usr/local/bin on all saa exec calls so
  acpica_bin/acpidump is found relative to correct working directory
- build.sh: copy all saa companion dirs (acpica_bin, ExternalData,
  tool, stunnel, GO_SNMP) to /usr/local/bin/ preserving structure
- iso/vendor: add acpica_bin/acpiexec, ExternalData/, tool/gpu/nVidia/x64/,
  tool/USBController/, stunnel/, GO_SNMP/ from SAA 1.5.0 release package

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

iso/builder/build.sh

@@ -1483,15 +1483,16 @@ for tool in storcli64 sas2ircu sas3ircu arcconf ssacli saa; do
     fi
 done
 
-# saa requires acpica_bin/acpidump relative to its own location
-if [ -f "${VENDOR_DIR}/acpica_bin/acpidump" ]; then
-    mkdir -p "${OVERLAY_STAGE_DIR}/usr/local/bin/acpica_bin"
-    cp "${VENDOR_DIR}/acpica_bin/acpidump" "${OVERLAY_STAGE_DIR}/usr/local/bin/acpica_bin/acpidump"
-    chmod +x "${OVERLAY_STAGE_DIR}/usr/local/bin/acpica_bin/acpidump" || true
-    echo "vendor tool: acpica_bin/acpidump (included)"
-else
-    echo "vendor tool: acpica_bin/acpidump (not found, skipped)"
-fi
+# saa companion directories — saa searches for these relative to CWD (/usr/local/bin)
+for saa_subdir in acpica_bin ExternalData tool stunnel GO_SNMP; do
+    if [ -d "${VENDOR_DIR}/${saa_subdir}" ]; then
+        cp -r "${VENDOR_DIR}/${saa_subdir}" "${OVERLAY_STAGE_DIR}/usr/local/bin/"
+        find "${OVERLAY_STAGE_DIR}/usr/local/bin/${saa_subdir}" -type f -exec chmod +x {} \; 2>/dev/null || true
+        echo "vendor saa: ${saa_subdir}/ (included)"
+    else
+        echo "vendor saa: ${saa_subdir}/ (not found, skipped)"
+    fi
+done
 
 # --- NVIDIA kernel modules and userspace libs ---
 if [ "$BEE_GPU_VENDOR" = "nvidia" ]; then