fix: preserve offline deployment LF files

offline-backend-20260512/.gitattributes

@@ -0,0 +1,3 @@
+*.sh text eol=lf
+offline-runtime-requirements.txt text eol=lf
+wheelhouse/SHA256SUMS text eol=lf

offline-backend-20260512/start_backend_offline.sh

@@ -87,8 +87,9 @@ require_wheel 'redis-5.2.1-*.whl'
 
 if [ -f "${SCRIPT_DIR}/wheelhouse/SHA256SUMS" ]; then
   require_cmd sha256sum
+  require_cmd sed
   echo "Verifying wheelhouse checksums"
-  (cd "${SCRIPT_DIR}/wheelhouse" && sha256sum -c SHA256SUMS)
+  (cd "${SCRIPT_DIR}/wheelhouse" && sed 's/\r$//' SHA256SUMS | sha256sum -c -)
 fi
 
 mkdir -p "${SCRIPT_DIR}/data"