docs(milvus): add guides and examples

docs/examples/milvus/quickstart/distributed.yaml

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+apiVersion: kubedb.com/v1alpha2
+kind: Milvus
+metadata:
+  name: milvus-cluster
+  namespace: demo
+spec:
+  version: "2.6.11"
+  objectStorage:
+    configSecret:
+      name: my-release-minio
+  topology:
+    mode: Distributed
+    distributed:
+      mixcoord:
+        replicas: 2
+  storageType: Durable
+  storage:
+    accessModes:
+      - ReadWriteOnce
+    storageClassName: local-path
+    resources:
+      requests:
+        storage: 10Gi

docs/guides/milvus/README.md

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+---
+title: Milvus
+menu:
+  docs_{{ .version }}:
+    identifier: milvus-readme
+    name: Milvus
+    parent: milvus-guides
+    weight: 10
+menu_name: docs_{{ .version }}
+section_menu_id: guides
+url: /docs/{{ .version }}/guides/milvus/
+aliases:
+  - /docs/{{ .version }}/guides/milvus/README/
+---
+
+> New to KubeDB? Please start [here](/docs/README.md).
+
+# Overview
+
+KubeDB supports vector database deployment with Milvus using the `Milvus` CRD.
+
+## Supported Milvus Features
+
+| Features                         | Availability |
+|----------------------------------|:------------:|
+| Standalone provisioning          |   ✓   |
+| Distributed provisioning         |   ✓   |
+| Monitoring                       |   ✓   |
+| TLS                              |      No      |
+| Ops Requests                     |      No      |
+
+## Example Milvus Manifest
+
+```yaml
+apiVersion: kubedb.com/v1alpha2
+kind: Milvus
+metadata:
+  name: milvus-cluster
+  namespace: demo
+spec:
+  version: "2.6.11"
+  objectStorage:
+    configSecret:
+      name: "my-release-minio"
+  topology:
+    mode: Distributed
+    distributed:
+      mixcoord:
+        replicas: 2
+  storageType: Durable
+  storage:
+    accessModes:
+      - ReadWriteOnce
+    storageClassName: local-path
+    resources:
+      requests:
+        storage: 10Gi
+```
+
+## User Guide
+
+- [Quickstart Milvus](/docs/guides/milvus/quickstart/quickstart.md) with KubeDB operator.
+- [Milvus CRD Concept](/docs/guides/milvus/concepts/milvus.md).
+- [MilvusVersion CRD Concept](/docs/guides/milvus/concepts/catalog.md).
+- [MilvusOpsRequest CRD Concept](/docs/guides/milvus/concepts/opsrequest.md).
+- [RBAC Quickstart](/docs/guides/milvus/quickstart/rbac.md)
+- [Private Registry](/docs/guides/milvus/private-registry/using-private-registry.md)
+- [Custom RBAC](/docs/guides/milvus/custom-rbac/using-custom-rbac.md)
+- [Custom Configuration](/docs/guides/milvus/configuration/using-config-file.md)
+- [Monitoring](/docs/guides/milvus/monitoring/overview.md) for metrics collection guidance.
+- [Builtin Prometheus Monitoring](/docs/guides/milvus/monitoring/using-builtin-prometheus.md)
+- [Prometheus Operator Monitoring](/docs/guides/milvus/monitoring/using-prometheus-operator.md)

docs/guides/milvus/_index.md

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+---
+title: Milvus
+menu:
+  docs_{{ .version }}:
+    identifier: milvus-guides
+    name: Milvus
+    parent: guides
+    weight: 15
+menu_name: docs_{{ .version }}
+---

docs/guides/milvus/concepts/_index.md

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+---
+title: Milvus Concepts
+menu:
+  docs_{{ .version }}:
+    identifier: milvus-concepts
+    name: Concepts
+    parent: milvus-guides
+    weight: 15
+menu_name: docs_{{ .version }}
+---

docs/guides/milvus/concepts/catalog.md

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+---
+title: MilvusVersion CRD
+menu:
+  docs_{{ .version }}:
+    identifier: milvus-catalog-concepts
+    name: MilvusVersion
+    parent: milvus-concepts-milvus
+    weight: 15
+menu_name: docs_{{ .version }}
+section_menu_id: guides
+---
+
+> New to KubeDB? Please start [here](/docs/README.md).
+
+# MilvusVersion
+
+## What is MilvusVersion
+
+`MilvusVersion` is the catalog CRD that defines the Milvus engine image and related metadata for KubeDB-managed Milvus deployments.
+
+KubeDB uses this CRD when resolving `Milvus.spec.version`.
+
+## MilvusVersion Specification
+
+```yaml
+apiVersion: catalog.kubedb.com/v1alpha1
+kind: MilvusVersion
+metadata:
+  name: "2.6.11"
+spec:
+  version: "2.6.11"
+  db:
+    image: "kubedb/milvus:2.6.11"
+  etcdVersion: v3.5.21
+  deprecated: false
+```
+
+## Key fields
+
+- `metadata.name` is referenced from `Milvus.spec.version`.
+- `spec.version` is the Milvus release version.
+- `spec.db.image` is the image used for Milvus components.
+- `spec.deprecated` indicates whether the entry is deprecated.
+
+## Next Steps
+
+- Read the [Milvus CRD concept](/docs/guides/milvus/concepts/milvus.md).
+- Run the [Milvus quickstart](/docs/guides/milvus/quickstart/quickstart.md).