Fix 'os' import error in replace-file cleanup

- Remove redundant 'import os' inside try block
- os module already imported at top of file
- Fixes: local variable 'os' referenced before assignment

aiScanner/api.py

@@ -1275,7 +1275,6 @@ def scanner_replace_file(request):
 
         # Clean up CyberPanel temp file
         try:
-            import os
             os.remove(cyberpanel_temp)
         except:
             pass