Perl to the rescue!

perl -e '
    print for sort { (($a =~ m{.*/([^0-9]*)})[0] cmp ($b =~ m{.*/([^0-9]*)})[0])
                     ||
                     (($a =~ /-([0-9]+)/)[0] <=> ($b =~ /-([0-9]+)/)[0]) } <>
' -- /tmp/foo.txt

• <> reads the lines of input
• sort sorts the list based on the given code
• m{.*/([^0-9]*)} extracts the basename up to a digit (if present)
• cmp does the string comparison
• If they are equal, the || or applies the second comparison, where:
• /-([0-9]+)/ extracts the number
• <=> does the numeric comparison
• The (...)[0] construct is needed as matching returns a list of matches (corresponding to $1, $2, etc). List context is needed to get the matches. We're interested in the first match only (as there's no other).

Perl to the rescue!

perl -e '
    print for sort { (($a =~ m{.*/([^0-9]*)})[0] cmp ($b =~ m{.*/([^0-9]*)})[0])
                     ||
                     (($a =~ /-([0-9]+)/)[0] <=> ($b =~ /-([0-9]+)/)[0]) } <>
' -- /tmp/foo.txt

• <> reads the lines of input
• sort sorts the list based on the given code
• m{.*/([^0-9]*)} extracts the basename up to a digit (if present)
• cmp does the string comparison
• If they are equal, the || "or" applies the second comparison, where:
• /-([0-9]+)/ extracts the number
• <=> does the numeric comparison
• The (...)[0] construct is needed as matching returns a list of matches (corresponding to $1, $2, etc). List context is needed to get the matches. We're interested in the first match only (as there's no other).