Add `container.network_aliases: Vec<String>` (serde default, DNS-label
validated) so a stack member can answer to short hostnames its peers bake
in, beyond its own container name. Rendered in both runtime paths:
- podman_client: merged (deduped) into the custom-network aliases array.
- quadlet from_manifest: appended after the container name; emitted only
for Bridge networks (slirp/pasta reject aliases).
Needed for the indeedhub migration: its frontend nginx proxies to
`api:4000` / `minio:9000` / `relay:8080`, so those members declare
`network_aliases: [api|minio|relay]` to keep the short names resolvable on
the dedicated indeedhub-net (vs. colliding generic aliases on archy-net).
Also fixes 4 pre-existing from_manifest test failures (unrelated to this
change, surfaced now that the quadlet suite runs green): test manifests
used the long-invalid `network_policy: archy-net` (allowlist is
isolated/bridge/host → moved to network_policy: isolated + container.network)
and bind sources outside /var/lib/archipelago.
Tests: container crate 53 pass; archipelago quadlet+alias 47 pass.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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