Mention default port used by base/node in the README

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Description

When starting base/node, it runs on a default port, but this isn’t clearly mentioned in the documentation. A quick note would help new users avoid confusion during setup.
New users may not know which port the node listens on by default and may think the service isn’t running or accessible. This can lead to unnecessary debugging during first-time setup.

Expected Behavior

The documentation should clearly state the default port used by base/node.

Proposed Solution

Add a short line to the README that mentions the default port and where it can be changed if needed.