Fix for scan_research.py : SyntaxError: f-string expression part cannot include a backslash

[codeisnotcode]

Error of:
...nvlabs/UniversalDeepResearch/backend/scan_research.py", line 507
for topic, segments in topic_relevant_segments.items()
^^^
SyntaxError: f-string expression part cannot include a backslash

The fix is to change line 507 in scan_research.py from:
f"Topic: {topic}\n{'\n'.join(segments)}"
to
f"Topic: {topic}\n{chr(10).join(segments)}"

I can't do a PR on this computer.