## What this PR does
Adds OpenBAO (open-source Vault fork) as a new managed PaaS application
in Cozystack.
**Structure follows existing app patterns (qdrant, nats):**
- System chart with vendored upstream `openbao/openbao` (chart v0.25.3,
appVersion v2.5.0)
- App chart with standalone/HA mode switching based on replicas count
- TLS via cert-manager self-signed certificates per instance
- ApplicationDefinition, PackageSource, PaaS bundle entry
- E2E test with init/unseal workflow
**Key design decisions:**
- `replicas: 1` → standalone mode with file storage; `replicas > 1` → HA
with Raft integrated storage and retry_join with TLS peer verification
- TLS enabled by default — each instance gets a self-signed Certificate
with DNS SANs covering services and pod addresses
- `disable_mlock = true` in HCL config since default security context
drops IPC_LOCK capability
- Injector and CSI provider disabled (cluster-scoped components, not
safe per-tenant)
- No auto-init/unseal — OpenBAO requires manual initialization by design
- E2E test performs full lifecycle: deploy, wait for certificate + API,
init, unseal, verify readiness, cleanup
### Release note
```release-note
[apps] Add OpenBAO as a managed secrets management service with standalone and HA Raft modes, TLS enabled by default
```
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
## Release Notes
* **New Features**
* Added OpenBAO managed secrets management service with
high-availability and standalone deployment options
* Integrated monitoring and dashboards for operational visibility
* Enabled configurable external access and web UI
* Added automated snapshot backup capability
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
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