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/admin_docs_versioned_docs/version-6.1.0/configuration/country-map-tools.mdx

@@ -0,0 +1,40 @@
+---
+title: Country Map Tools
+sidebar_position: 10
+version: 1
+---
+
+import countriesData from '../_versioned_data/data/countries.json';
+
+# The Country Map Visualization
+
+The Country Map visualization allows you to plot lightweight choropleth maps of
+your countries by province, states, or other subdivision types. It does not rely
+on any third-party map services but would require you to provide the
+[ISO-3166-2](https://en.wikipedia.org/wiki/ISO_3166-2) codes of your country's
+top-level subdivisions. Comparing to a province or state's full names, the ISO
+code is less ambiguous and is unique to all regions in the world.
+
+## Included Maps
+
+The current list of countries can be found in the src
+[legacy-plugin-chart-country-map/src/countries.ts](https://github.com/apache/superset/blob/master/superset-frontend/plugins/legacy-plugin-chart-country-map/src/countries.ts)
+
+The Country Maps visualization already ships with the maps for the following countries:
+
+<ul style={{columns: 3}}>
+{countriesData.countries.map((country, index) => (
+  <li key={index}>{country}</li>
+))}
+</ul>
+
+## Adding a New Country
+
+To add a new country to the list, you'd have to edit files in
+[@superset-ui/legacy-plugin-chart-country-map](https://github.com/apache/superset/tree/master/superset-frontend/plugins/legacy-plugin-chart-country-map).
+
+1. Generate a new GeoJSON file for your country following the guide in [this Jupyter notebook](https://github.com/apache/superset/blob/master/superset-frontend/plugins/legacy-plugin-chart-country-map/scripts/Country%20Map%20GeoJSON%20Generator.ipynb).
+2. Edit the countries list in [legacy-plugin-chart-country-map/src/countries.ts](https://github.com/apache/superset/blob/master/superset-frontend/plugins/legacy-plugin-chart-country-map/src/countries.ts).
+3. Install superset-frontend dependencies: `cd superset-frontend && npm install`
+4. Verify your countries in Superset plugins storybook: `npm run plugins:storybook`.
+5. Build and install Superset from source code.