T8764: add per-repo CodeRabbit config — Jira VD project scope

Add `.coderabbit.yaml` at repo root with the minimum override needed
to (a) opt the VyOS-Networks mirror into the central Jira integration
and (b) scope it to the VD (VyOS Dev) project.

Cross-org behavior using `usage: auto`:

* On `vyos/vyos-1x` (this repo, public): `auto` self-disables on
  public repos, so no Jira context is fetched. The vyos-org
  CodeRabbit install has no Atlassian OAuth grant anyway — CodeRabbit
  allows one GitHub-org → Jira-tenant link per install, and that link
  is attached to the `VyOS-Networks` org.
* On `VyOS-Networks/vyos-1x` (gen-1 mirror, private/internal): `auto`
  activates the integration and `project_keys: [VD]` restricts the
  context to VD tickets only — matching the project keys used in
  release-train work tracked there.

Everything else (review profile, tools, chat ACL, path filters,
finishing-touches behavior, etc.) continues to inherit from the
respective central baseline:
  - https://github.com/vyos/coderabbit/blob/production/.coderabbit.yaml
  - https://github.com/VyOS-Networks/coderabbit/blob/production/.coderabbit.yaml

Pattern note: this is the canary for the source-of-truth-on-vyos
approach. Once it lands clean, the same file (with the same or
slightly different `project_keys`) should be mirrored to the other
vyos-org source repos that have VyOS-Networks mirrors.

🤖 Generated by [robots](https://vyos.io)

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