Enforce LF for api/public/*.txt

Add a .gitattributes rule to treat api/public/*.txt as text with LF endings. Normalize the EOLs for rustapi-rs.all-features.txt and rustapi-rs.default.txt (appearing as binary diffs due to line-ending changes).

Author: Tuntii

.gitattributes

@@ -1,2 +1,3 @@
 # Auto detect text files and perform LF normalization
 * text=auto
+api/public/*.txt text eol=lf