T8764: add `inheritance: true` so central baseline is actually inherited

Follow-up to #5191 — the original PR landed without this flag, which
means the per-repo `.coderabbit.yaml` was REPLACING the central baseline
(`vyos/coderabbit:.coderabbit.yaml`) instead of merging with it.

Per https://docs.coderabbit.ai/configuration/configuration-inheritance:

> Inheritance is disabled by default. You must explicitly enable it
> by adding `inheritance: true`.
>
> Without inheritance, only the highest-priority source is used.
>
> Each level with `inheritance: true` merges with its parent. The
> chain stops at the first level where `inheritance: false` or unset.

Today, every PR review on this repo is using ONLY the contents of
`.coderabbit.yaml` (this file) — the central baseline's review profile,
tools, chat ACL, finishing-touches settings, etc. are all dropped.
Adding `inheritance: true` restores merging.

Caught by CodeRabbit's auto-review on the sibling per-repo PR
VyOS-Networks/next-js-cpd#1. Did not surface on the original #5191
because CodeRabbit's OSS-security policy ignores YAML config changes
from the PR itself on public repos — it reviews against the base
branch, which didn't have this file yet.

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

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