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

Snapshots all four versioned Docusaurus sections at v6.1.0. Built on
top of the version-cutting tooling work in chore/docs-cut-6.1.0-versions
so the snapshot benefits from:

- Auto-gen refresh before snapshotting (database pages from engine
  spec metadata, API reference from openapi.json, component pages
  from Storybook stories) — captured at the SHA we cut from rather
  than whatever happened to be on disk.
- Data-import freeze: country list, feature flag table, database
  diagnostics, and component metadata are copied into snapshot-local
  `_versioned_data/` dirs so the historical version doesn't silently
  mutate when the source files change.
- Depth-aware import-path rewriter that handles deeply-nested
  component MDX files referencing `../../../src/` from the snapshot.

Versioning behavior: `lastVersion` stays at `current` for every
section, so the canonical URLs (`/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. The plugin block in docusaurus.config.ts
was already gated only by the `disabled` flag, so no other code
changes were needed to bring it back online.

The frozen `databases.json` in the snapshot is the canonical 80-database
artifact from the latest committed state in master (preserved by the
generator's input-hash cache), not a fallback regenerated from a
local Flask environment.

docs/developer_docs_versioned_docs/version-6.1.0/api/get-security-user-registrations.api.mdx

@@ -0,0 +1,68 @@
+---
+id: get-security-user-registrations
+title: "Get security user registrations"
+description: "Get a list of models"
+sidebar_label: "Get security user registrations"
+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 user registrations"}
+>
+</Heading>
+
+<MethodEndpoint
+  method={"get"}
+  path={"/api/v1/security/user_registrations/"}
+  context={"endpoint"}
+>
+
+</MethodEndpoint>
+
+
+
+Get a list of models
+
+<Heading
+  id={"request"}
+  as={"h2"}
+  className={"openapi-tabs__heading"}
+>
+  <Translate id="theme.openapi.request.title">Request</Translate>
+</Heading>
+
+<ParamsDetails
+  {...require("./get-security-user-registrations.ParamsDetails.json")}
+>
+
+</ParamsDetails>
+
+<RequestSchema
+  {...require("./get-security-user-registrations.RequestSchema.json")}
+>
+
+</RequestSchema>
+
+<StatusCodes
+  {...require("./get-security-user-registrations.StatusCodes.json")}
+>
+
+</StatusCodes>