fix(server): fix check_port port extraction for schemeless URLs

[bitflicker64]

Purpose of the PR

• close [Bug] check_port in util.sh fails when restserver.url has no scheme prefix #3004

check_port() in util.sh uses awk -F':' '{print $3}' to extract the port, which assumes a 3-part URL like http://host:port. Since #2944 changed the default restserver.url to host:port format (no scheme), field $3 is empty and lsof -i : fails with:

lsof: unacceptable port specification in: -i :

Main Changes

Replace awk with sed in check_port() across all three util.sh files:

# before
local port=$(echo "$1" | awk -F':' '{print $3}')

# after  
local port=$(echo "$1" | sed 's|.*:||' | sed 's|/.*||')

This handles all URL formats correctly — host:port, http://host:port, http://host:port/path, and IPv6. Also modernizes backtick syntax to $() in pd and store.

Verifying these changes

• Trivial rework / code cleanup without any test coverage. (No Need)

Does this PR potentially affect the following parts?

• Nope

Documentation Status

• Doc - No Need