feat(format): add script for formatting and checking header files

format.sh

@@ -0,0 +1,2 @@
+find webserv -name "*.cpp" -o -name "*.hpp" | xargs clang-format -i
+find webserv -name "*.hpp" -exec sh -c 'if ! grep -q "#pragma once" "$1"; then echo "Missing #pragma once in $1"; fi' _ {} \;