Hello, Thanks for mapping on this project.
You tag highways=footway
This tag is to be used in urban areas, like paths in parks, busy shopping areas (pedestrians only)
Here. just tag that path as highway is path. By default a path is unpaved.
Only in urban areas, highways can be tagged as residential. others are often unclassified.
Don't connect nodes of highways to buildings. These are errors and need to be corrected.
Best regards