chore: normalize line endings (CRLF -> LF)

No content changes: git diff --ignore-all-space over these files is empty.
The churn came from editing on Windows against a repo checked out with LF.

backend/copy-do-pfm.sh

@@ -1,8 +1,8 @@
-#!/bin/bash
-# Create the target directory inside the Next.js app
-mkdir -p pfm-web-app/public/do-pfm
-
-# Copy DO-PFM images
-cp -v PaddleOCR-VL-1.6_Online_Demo/examples/do-pfm/*.jpg pfm-web-app/public/do-pfm/
-
-echo "DO-PFM examples copied successfully!"
+#!/bin/bash
+# Create the target directory inside the Next.js app
+mkdir -p pfm-web-app/public/do-pfm
+
+# Copy DO-PFM images
+cp -v PaddleOCR-VL-1.6_Online_Demo/examples/do-pfm/*.jpg pfm-web-app/public/do-pfm/
+
+echo "DO-PFM examples copied successfully!"