run: Forward documents using the sandbox mount path

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The document portal is mounted at /run/flatpak/doc inside the sandbox,
but forwarded arguments used its host mount path. With a nonstandard
host runtime directory, that path is inaccessible to the application.

Keep the host path local to mount setup and return the sandbox destination
to argument forwarding. Preserve NULL when the portal is unavailable.

Add real-portal regression tests for user and isolated system installs.
Check file read/write, escaped URIs, directories and passthrough controls.
Skip the directory subtest on portal interfaces older than version 4.

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