oci: Stop persisting bearer token to child repo on disk

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The .token file was written into the child-oci directory so the
system helper could read it back for remote registry verification.
However, the system helper only ever opens the child-oci registry
as a local source (dfd != -1), and every code path that uses
self->token for HTTP requests is gated behind dfd == -1. The token
was never reachable since it was introduced in commit 5d8fd2d1b.

Persisting credentials to a world-traversable directory in /var/tmp
is a security risk on multi-user systems. Remove the file write
from set_token and the file read from ensure_local. The token
remains available in memory for the client process that actually
needs it for remote access.

Resolves: CVE-2026-97025
Resolves: https://github.com/flatpak/flatpak/security/advisories/GHSA-7rvf-rqr3-43j4

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