Arsolitt e76bde7676 feat(nats): add TLS support via cert-manager (#2684)
## What this PR does

Adds TLS support to the NATS managed service via cert-manager.

- Introduces a nullable `tls.enabled` field with tri-state semantics:
when unset, defaults to the value of `external` (auto-on for externally
published services, off for cluster-internal). Explicit `tls.enabled`
always wins.
- Renders a self-contained cert-manager chain in the tenant namespace:
self-signed Issuer, CA Certificate, CA Issuer, leaf Certificate.
- SAN policy covers the three DNS forms per service (bare, `.ns.svc`,
`.ns.svc.<cluster-domain>`) plus the external hostname when `external:
true`.
- Wires the leaf cert into the NATS HelmRelease so client connections
and cluster routes both use the chart-managed CA chain.

Verified end-to-end on a sandbox cluster: cert chain reaches Ready, TLS
handshake against the tenant service succeeds with the chart CA bundle.

### Release note

```release-note
feat(nats): add TLS support via cert-manager (tri-state tls.enabled)
```


<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **New Features**
* Added optional TLS support for NATS with a nullable/tri-state
tls.enabled (true/false/null) that defaults to external access when
unset
* Conditional cert-manager integration to provision CA and TLS
certificates and enable cluster TLS, and toggle cluster routing to FQDN
when TLS is enabled

* **Documentation**
* Updated configuration docs and schema defaults to include new TLS
settings and fallback behavior

* **Tests**
* Added tests validating tri-state TLS behavior, cert-chain generation,
SANs, and conditional rendering

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