Adds a boolean `externalRouting` flag (default `true`) on
ResolvedContainerConfig. When `false`, TraefikLabelBuilder emits only
the identity labels (`managed-by`, `cameleer.*`) and skips every
`traefik.*` label, so the container is not published by Traefik.
Sibling containers on `cameleer-traefik` / `cameleer-env-{tenant}-{env}`
can still reach it via Docker DNS on whatever port the app listens on.
TDD: new TraefikLabelBuilderTest covers enabled (default labels present),
disabled (zero traefik.* labels), and disabled (identity labels retained)
cases. Full module unit suite: 208/0/0.
Plumbed through ConfigMerger read, DeploymentExecutor snapshot, UI form
state, Resources tab toggle, POST payload, and snapshot-to-form mapping.
Rule files updated.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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