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/schemas/chartdataresponseschema.Schema.json

@@ -0,0 +1 @@
+{"schema":{"properties":{"result":{"description":"A list of results for each corresponding query in the request.","items":{"properties":{"annotation_data":{"description":"All requested annotation data","items":{"additionalProperties":{"type":"string"},"type":"object"},"nullable":true,"type":"array"},"applied_filters":{"description":"A list with applied filters","items":{"type":"object"},"type":"array"},"cache_key":{"description":"Unique cache key for query object","nullable":true,"type":"string"},"cache_timeout":{"description":"Cache timeout in following order: custom timeout, datasource timeout, cache default timeout, config default cache timeout.","nullable":true,"type":"integer"},"cached_dttm":{"description":"Cache timestamp","nullable":true,"type":"string"},"colnames":{"description":"A list of column names","items":{"type":"string"},"type":"array"},"coltypes":{"description":"A list of generic data types of each column","items":{"type":"integer"},"type":"array"},"data":{"description":"A list with results","items":{"type":"object"},"type":"array"},"detected_currency":{"default":null,"description":"Detected ISO 4217 currency code when AUTO mode is used. Returns the currency code if all filtered data contains a single currency or null if multiple currencies are present.","nullable":true,"type":"string"},"error":{"description":"Error","nullable":true,"type":"string"},"from_dttm":{"description":"Start timestamp of time range","nullable":true,"type":"integer"},"is_cached":{"description":"Is the result cached","type":"boolean"},"queried_dttm":{"description":"UTC timestamp when the query was executed (ISO 8601 format)","nullable":true,"type":"string"},"query":{"description":"The executed query statement. May be absent when validation errors occur.","nullable":true,"type":"string"},"rejected_filters":{"description":"A list with rejected filters","items":{"type":"object"},"type":"array"},"rowcount":{"description":"Amount of rows in result set","type":"integer"},"stacktrace":{"description":"Stacktrace if there was an error","nullable":true,"type":"string"},"status":{"description":"Status of the query","enum":["stopped","failed","pending","running","scheduled","success","timed_out"],"type":"string"},"to_dttm":{"description":"End timestamp of time range","nullable":true,"type":"integer"}},"required":["cache_key","cache_timeout","cached_dttm","is_cached","queried_dttm"],"type":"object","title":"ChartDataResponseResult"},"type":"array"}},"type":"object","title":"ChartDataResponseSchema"},"schemaType":"response"}