Phase 1: Add MariaDB operator installation

mariadb-operator/README.md

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+# MariaDB Operator
+
+This folder contains the MariaDB operator installation for the cluster.
+
+## Components
+
+- **operator-crds-helm.yaml**: Installs MariaDB operator CRDs (v25.10.4)
+- **operator-helm.yaml**: Installs MariaDB operator (v25.10.4)
+- **kustomization.yaml**: Kustomize manifest for organizing resources
+
+## Configuration
+
+- **Namespace**: `mariadb-system`
+- **Chart Repository**: https://mariadb-operator.github.io/mariadb-operator
+- **Chart Version**: 25.10.4
+- **Metrics**: Enabled (ServiceMonitor disabled - Prometheus Operator not installed)
+
+## Managed By
+
+ArgoCD Application: `mariadb-operator-install` (defined in `/apps/templates/mariadb-operator-folder.yaml`)
+
+## Usage
+
+MariaDB instances are created using the `MariaDB` CRD in application namespaces.
+See `/mbgwp/mariadb-cluster.yaml` for an example.