fix(cache): trim whitespace in delta count + use s3api for tagging

Two fixes:
1. Restore: Trim whitespace from DELTA_COUNT to fix integer comparison
2. Save: Use 's3api put-object' instead of 's3 cp' to support --tagging

The aws s3 cp command doesn't support --tagging parameter.
Switched to s3api put-object which supports tagging directly.
Tags are needed for lifecycle policies (30-day eviction).

.github/actions/xahau-actions-cache-restore/action.yml

@@ -107,6 +107,7 @@ runs:
           # Delete all delta layers for this key
           echo "Deleting all delta layers matching: ${CACHE_KEY}-delta-*"
           DELTA_COUNT=$(aws s3 ls "s3://${S3_BUCKET}/" --region "${S3_REGION}" | grep "${CACHE_KEY}-delta-" | wc -l || echo "0")
+          DELTA_COUNT=$(echo "${DELTA_COUNT}" | tr -d ' \n')  # Trim whitespace
           if [ "${DELTA_COUNT}" -gt 0 ]; then
             aws s3 rm "s3://${S3_BUCKET}/" --recursive \
               --exclude "*" \