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Add StandardInputFileDescriptor, StandardOutputFileDescriptor and StandardErrorFileDescriptor to the Service context of the Varlink StartTransient() method. Each carries the push-order index of a file descriptor passed along with the method call (via SCM_RIGHTS), and connects it to the transient service's standard input/output/error. This is the Varlink equivalent of the StandardInputFileDescriptor= / StandardOutputFileDescriptor= / StandardErrorFileDescriptor= D-Bus transient properties behind "systemd-run --pipe", which had no Varlink counterpart. The manager Varlink server now enables SD_VARLINK_SERVER_ALLOW_FD_PASSING_INPUT so clients may attach descriptors to their method calls, matching other fd-accepting Varlink services (mountfsd, networkd, vmspawn, ...). The indices are resolved with sd_varlink_peek_dup_fd() after the polkit authorization check and stored on the Service exactly like the D-Bus path (bus_set_transient_exec_context_fd()): the fds land in stdin_fd/stdout_fd/ stderr_fd and exec_context.stdio_as_fds is set, so the existing exec-invoke plumbing wires them to the spawned process unchanged. Unsuitable fds (bad index, wrong access mode) are rejected as InvalidParameter, other resolution failures propagate as raw errnos. Add coverage to TEST-74-AUX-UTILS.varlinkctl-unit.sh, passing regular files as the stdout/stderr fds and asserting the unit's output lands on them.