docs: cut 6.1.0 versions for user_docs, admin_docs, developer_docs, components

Snapshots all four versioned Docusaurus sections at v6.1.0, cut from
master after the version-cutting tooling (#39837), broken-internal-
links fix (#40102), and user_docs rename (#40171) all landed. With
the rename in place, all four sections now produce parallel-named
files at the docs/ root (no more bare `versioned_docs/` outlier).

Versioning behavior: lastVersion stays at current for every section,
so the canonical URLs (/user-docs/..., /admin-docs/...,
/developer-docs/..., /components/...) continue to render content
from master. The current version is consistently labeled "Next"
with an unreleased banner, and 6.1.0 is a historical pin accessible
only via its explicit version segment.

Component playground: previously disabled: true in versions-config.json,
now enabled and versioned.

Snapshot includes:
- All MDX content for the four sections.
- Auto-gen captured fresh: 74 database pages (engine spec metadata),
  ~1,800 API reference files (openapi.json), 59 component pages
  (Storybook stories).
- Data imports frozen at cut time into snapshot-local _versioned_data/
  dirs:
    user_docs_versioned_docs/version-6.1.0/_versioned_data/src/data/databases.json
      (canonical 80-database diagnostics from master, preserved by the
      generator's input-hash cache)
    admin_docs_versioned_docs/version-6.1.0/_versioned_data/data/countries.json
    admin_docs_versioned_docs/version-6.1.0/_versioned_data/static/feature-flags.json
    developer_docs_versioned_docs/version-6.1.0/_versioned_data/static/data/components.json
- Import paths in deeply-nested files rewritten so they still resolve
  from one directory deeper inside the snapshot.
- developer_docs/extensions/overview.md snapshot has the FIXED
  ./mcp.md form (from #40102), so the SPA-nav 404 isn't baked into
  the 6.1.0 version.

Verified via full yarn build: exit 0, no broken links surfaced by
onBrokenLinks: throw.

docs/developer_docs_versioned_docs/version-6.1.0/api/get-security-roles-by-pk.api.mdx

@@ -0,0 +1,68 @@
+---
+id: get-security-roles-by-pk
+title: "Get security roles by pk"
+description: "Get an item model"
+sidebar_label: "Get security roles by pk"
+hide_title: true
+hide_table_of_contents: true
+api: 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
+sidebar_class_name: "get api-method"
+info_path: developer-docs/api/superset
+custom_edit_url: null
+hide_send_button: true
+show_extensions: true
+---
+
+import MethodEndpoint from "@theme/ApiExplorer/MethodEndpoint";
+import ParamsDetails from "@theme/ParamsDetails";
+import RequestSchema from "@theme/RequestSchema";
+import StatusCodes from "@theme/StatusCodes";
+import OperationTabs from "@theme/OperationTabs";
+import TabItem from "@theme/TabItem";
+import Heading from "@theme/Heading";
+import Translate from "@docusaurus/Translate";
+
+<Heading
+  as={"h1"}
+  className={"openapi__heading"}
+  children={"Get security roles by pk"}
+>
+</Heading>
+
+<MethodEndpoint
+  method={"get"}
+  path={"/api/v1/security/roles/{pk}"}
+  context={"endpoint"}
+>
+
+</MethodEndpoint>
+
+
+
+Get an item model
+
+<Heading
+  id={"request"}
+  as={"h2"}
+  className={"openapi-tabs__heading"}
+>
+  <Translate id="theme.openapi.request.title">Request</Translate>
+</Heading>
+
+<ParamsDetails
+  {...require("./get-security-roles-by-pk.ParamsDetails.json")}
+>
+
+</ParamsDetails>
+
+<RequestSchema
+  {...require("./get-security-roles-by-pk.RequestSchema.json")}
+>
+
+</RequestSchema>
+
+<StatusCodes
+  {...require("./get-security-roles-by-pk.StatusCodes.json")}
+>
+
+</StatusCodes>