## What this PR does
Adds MongoDB as a managed application to Cozystack using Percona
Operator for MongoDB (Apache 2.0).
**New packages:**
- `packages/system/mongodb-operator/` - Percona psmdb-operator
deployment
- `packages/apps/mongodb/` - MongoDB application chart
- `packages/system/mongodb-rd/` - CozystackResourceDefinition for
dashboard
**Features:**
- Replica set mode with configurable replica count
- Sharded cluster mode (config servers, mongos routers, multiple shards)
- S3 backup integration with cron scheduling
- Point-in-time recovery from backups
- External access via LoadBalancer
- Multiple MongoDB versions (v6, v7, v8)
- Resource presets (nano to 2xlarge)
- User management with role-based access
### Release note
```release-note
[apps] Add MongoDB as a managed application with replica set, sharding, and S3 backup support
```
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **New Features**
* Managed MongoDB service and operator packaging; replica sets with
optional sharding, external access, per-user credentials, workload
monitoring, and version mappings for provider images
* Backup & restore with S3 support and point-in-time recovery
* **Documentation**
* Comprehensive README plus Helm values and schema for configuration
* **Tests**
* Extensive unit/template tests and end-to-end tests covering
credentials, services, backup, restore, CR rendering, and operator
install
* **Packaging**
* Charts and bundle entries added for operator and managed service
installation
<sub>✏️ Tip: You can customize this high-level summary in your review
settings.</sub>
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
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