Revert "fix: remove port requirement for supernode from lumera (#136)

[mateeullahmalik]

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[Copilot]

Pull Request Overview

This PR reverts a previous change that removed the port requirement for supernodes from the Lumera protocol. The revert restores the requirement that supernodes must specify their port as part of their endpoint configuration.

• Restores port requirement in supernode registration by modifying the test helper function to accept a port parameter
• Updates configuration files to use specific ports and localhost binding instead of IP-only addressing
• Removes the default port constant and associated logic that was previously added to handle port-less endpoints

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
tests/system/e2e_cascade_test.go	Updates supernode registration test to require port parameter and use localhost:port format
tests/system/config.test-1.yml	Changes host from 127.0.0.1 to 0.0.0.0 for broader network binding
tests/system/config.test-2.yml	Updates host binding and assigns unique port/gateway_port values
tests/system/config.test-3.yml	Updates host binding and assigns unique port/gateway_port values
sdk/net/impl.go	Removes default port appending logic and reverts to using endpoints as provided
sdk/config/constants.go	Completely removes the file containing DefaultSupernodePort constant

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