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fix(server): Explicitly bind to IPv4 loopback

In some environments, 'localhost' might resolve to the IPv6 loopback
address '::1' which is often unexpected. This can especially lead to
problems where other tools might resolve 'localhost' differently in the
same environment.

This change explicitly binds to the IPv4 loopback address '127.0.0.1'
instead of resolving the address from 'localhost'.

In case remote connections are allowed, no host is specified so that
Node.js binds to either the unspecified IPv4 or -IPv6 address (which
usually also accepts IPv4 connections) [1]

[1] https://nodejs.org/docs/latest-v25.x/api/net.html#serverlistenport-host-backlog-callback

Cherry-pick of https://github.com/SAP/ui5-server/pull/763

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