Milvus: document GPU and SR-IOV networking support

[tamalsaha]

What

Documents the user-facing surface of pl2/milvus-fixes/sriov-gpu-design.md: spec.gpu (Standalone top-level and per Distributed role) and spec.network.sriov (per Distributed role, with a Standalone-scoped subset), including the follow-ups added after the initial kubedb/apimachinery#1898/kubedb/milvus#69 pass.

• concepts/milvus.md: adds spec.gpu/spec.network field reference sections, including the optional network.sriov.gds second attachment and spec.topology.distributed.<role>.groups (heterogeneous GPU pools, with per-group storageType/storage for streamingnode).
• guides/milvus/gpu-sriov/: guide covering the MilvusVersion GPU capability gate, why the SR-IOV advertise-IP init container is Distributed-only (now documenting both the user.yaml file overlay and the MILVUS_CONF_<SECTION>_IP env-var mechanism it runs belt-and-braces), the topology-coupling requirement, GPU Direct Storage via network.sriov.gds, groups (including scoping a MilvusOpsRequest to a single group), the Milvus.status.conditions[SRIOVNetworkAttached] condition, a full worked example, and known limitations — carried over honestly from the design doc rather than overclaiming validation this hasn't had.

Depends on

Stacked on milvus-etcd (#1060). Companion to kubedb/apimachinery#1898 and kubedb/milvus#69.

Testing

No live-cluster verification — this guide is drafted from the CRD schema and the design doc, consistent with how the rest of this branch's docs were produced (per #1060's own testing note).

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