docs: cut 6.1.0 versions for 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) and broken-internal-
links fixes (#40102) landed. Captures fresh auto-generated content and
freezes data dependencies so the historical snapshot stays correct.

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.

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:
    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.

Verified via full yarn build: exit 0, no broken links surfaced by
onBrokenLinks: throw. Anchor warnings present are pre-existing on
master (community#superset-community-calendar) and unrelated.

docs/developer_docs_versioned_docs/version-6.1.0/api/get-security-groups.StatusCodes.json

@@ -0,0 +1 @@
+{"responses":{"200":{"content":{"application/json":{"schema":{"properties":{"count":{"description":"The total record count on the backend","type":"number"},"description_columns":{"properties":{"column_name":{"description":"The description for the column name. Will be translated by babel","example":"A Nice description for the column","type":"string"}},"type":"object"},"ids":{"description":"A list of item ids, useful when you don't know the column id","items":{"type":"string"},"type":"array"},"label_columns":{"properties":{"column_name":{"description":"The label for the column name. Will be translated by babel","example":"A Nice label for the column","type":"string"}},"type":"object"},"list_columns":{"description":"A list of columns","items":{"type":"string"},"type":"array"},"list_title":{"description":"A title to render. Will be translated by babel","example":"List Items","type":"string"},"order_columns":{"description":"A list of allowed columns to sort","items":{"type":"string"},"type":"array"},"result":{"description":"The result from the get list query","items":{"properties":{"description":{"maxLength":512,"nullable":true,"type":"string"},"id":{"type":"integer"},"label":{"maxLength":150,"nullable":true,"type":"string"},"name":{"maxLength":100,"type":"string"},"roles":{"properties":{"id":{"type":"integer"},"name":{"maxLength":64,"type":"string"}},"required":["name"],"type":"object","title":"GroupApi.get_list.Role"},"users":{"properties":{"id":{"type":"integer"},"username":{"maxLength":128,"type":"string"}},"required":["username"],"type":"object","title":"GroupApi.get_list.User"}},"required":["name"],"type":"object","title":"GroupApi.get_list"},"type":"array"}},"type":"object"},"example":{"count":1,"description_columns":{"column_name":"A Nice description for the column"},"ids":["string"],"label_columns":{"column_name":"A Nice label for the column"},"list_columns":["string"],"list_title":"List Items","order_columns":["string"],"result":[{}]}}},"description":"Items from Model"},"400":{"content":{"application/json":{"schema":{"properties":{"message":{"type":"string"}},"type":"object"},"example":{"message":"Bad request: Invalid parameters provided"}}},"description":"Bad request"},"401":{"content":{"application/json":{"schema":{"properties":{"message":{"type":"string"}},"type":"object"},"example":{"message":"Unauthorized: Authentication required"}}},"description":"Unauthorized"},"422":{"content":{"application/json":{"schema":{"properties":{"message":{"type":"string"}},"type":"object"},"example":{"message":"Unprocessable entity: Validation error"}}},"description":"Could not process entity"},"500":{"content":{"application/json":{"schema":{"properties":{"message":{"type":"string"}},"type":"object"},"example":{"message":"Internal server error: An unexpected error occurred"}}},"description":"Fatal error"}}}