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-resources.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":{"id":{"type":"integer"},"name":{"maxLength":250,"type":"string"}},"required":["name"],"type":"object","title":"ViewMenuApi.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"}}}