feat(admin): module skeleton, config and two database connections
Adds the admin module: env config with fail-fast validation, two MongoDB connections (its own vantage_admin database plus a narrow path into the control plane), the boot sequence and the image. Config refuses to start without a signing key, and both Mongo URIs must name their database inline -- admin talks to two databases, so a bare MONGO_DB would be ambiguous about which. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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