docs(mcp): enable the MCP subchart on self-managed

[ash0ts]

Summary

Stacked on top of #2531 (anish/docs-mcp-server-rework). Adds one new ## Enable the MCP server section to platform/hosting/self-managed/operator.mdx so self-managed operators can turn on the mcp-server subchart shipped in operator-wandb 0.42.1.

The parent PR rewrites the end-user MCP page (platform/mcp-server.mdx) and explicitly keeps "Helm values, operator chart versions, subchart names, or cluster-admin instructions" out of scope. This PR fills that gap on the operator side only.

What this adds

A single section between ### Verify the installation and ## Environment-specific considerations, with:

• Overview: what the subchart is, what <global.host>/mcp exposes, and a pointer to /platform/mcp-server for client setup.
• Prerequisites: chart 0.42.1+, weave-trace.install: true (hard fail-guard in the chart), ingress reachable at global.host, node headroom for default resource requests (500m CPU / 1Gi memory).
• Enable: minimal YAML patch for the existing WeightsAndBiases CR.
• Verify: in-cluster port-forward check against /mcp/health plus the same check through the ingress.
• Connect a client: one-line hand-off to /platform/mcp-server.
• Troubleshooting: 4-row table covering the weave-trace fail-guard, pod Pending due to resource requests, ingress 404 on /mcp, and image pull failures in air-gapped / mirrored clusters.

What this deliberately omits

• No Datadog / OpenTelemetry setup docs (the hosting section doesn't document Datadog anywhere today; adding it here would be inconsistent).
• No image registry details, GKE HTTP LB addon / NEG troubleshooting, or Workload Identity recipes. Operators use the default image or mirror via the one-line override noted in the troubleshooting table.
• No changes to platform/mcp-server.mdx (handled by docs(mcp): rework MCP server page for users #2531), localized fr/ja/ko copies (translation pipeline re-syncs from English), or docs.json nav (no new page).

Source references

• mcp-server subchart defaults: charts/operator-wandb/values.yaml lines 2845-2894.
• Fail-guard requiring weave-trace.install: charts/operator-wandb/templates/_mcp.tpl lines 7-11.
• Chart version floor 0.42.1: feat(MCP-32): Add MCP Server subchart for dedicated deployments helm-charts#571 (introduces the subchart) and fix(MCP-32): correct subchart-scope value access in wandb.mcpEnvs helm-charts#590 (scope fix in wandb.mcpEnvs).

Test plan

• mint dev renders platform/hosting/self-managed/operator.mdx without warnings.
• The new Enable the MCP server section appears in the right-rail TOC, between "Verify the installation" and "Environment-specific considerations".
• Cross-links to /platform/mcp-server and /platform/hosting/self-managed/on-premises-deployments/kubernetes-airgapped resolve.
• Anchor #enable-the-mcp-server is linkable from the parent PR's Dedicated/Self-Managed card once both merge.

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