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-database-table-metadata.StatusCodes.json

@@ -0,0 +1 @@
+{"responses":{"200":{"content":{"application/json":{"schema":{"properties":{"columns":{"description":"A list of columns and their metadata","items":{"properties":{"duplicates_constraint":{"type":"string"},"keys":{"description":"","items":{"type":"string"},"type":"array"},"longType":{"description":"The actual backend long type for the column","type":"string"},"name":{"description":"The column name","type":"string"},"type":{"description":"The column type","type":"string"}},"type":"object","title":"TableMetadataColumnsResponse"},"type":"array"},"foreignKeys":{"description":"A list of foreign keys and their metadata","items":{"properties":{"column_names":{"items":{"description":"A list of column names that compose the foreign key or  index","type":"string"},"type":"array"},"name":{"description":"The name of the foreign key or index","type":"string"},"options":{"properties":{"deferrable":{"type":"boolean"},"initially":{"type":"boolean"},"match":{"type":"boolean"},"ondelete":{"type":"boolean"},"onupdate":{"type":"boolean"}},"type":"object","title":"TableMetadataOptionsResponse"},"referred_columns":{"items":{"type":"string"},"type":"array"},"referred_schema":{"type":"string"},"referred_table":{"type":"string"},"type":{"type":"string"}},"type":"object","title":"TableMetadataForeignKeysIndexesResponse"},"type":"array"},"indexes":{"description":"A list of indexes and their metadata","items":{"properties":{"column_names":{"items":{"description":"A list of column names that compose the foreign key or  index","type":"string"},"type":"array"},"name":{"description":"The name of the foreign key or index","type":"string"},"options":{"properties":{"deferrable":{"type":"boolean"},"initially":{"type":"boolean"},"match":{"type":"boolean"},"ondelete":{"type":"boolean"},"onupdate":{"type":"boolean"}},"type":"object","title":"TableMetadataOptionsResponse"},"referred_columns":{"items":{"type":"string"},"type":"array"},"referred_schema":{"type":"string"},"referred_table":{"type":"string"},"type":{"type":"string"}},"type":"object","title":"TableMetadataForeignKeysIndexesResponse"},"type":"array"},"name":{"description":"The name of the table","type":"string"},"primaryKey":{"allOf":[{"properties":{"column_names":{"items":{"description":"A list of column names that compose the primary key","type":"string"},"type":"array"},"name":{"description":"The primary key index name","type":"string"},"type":{"type":"string"}},"type":"object","title":"TableMetadataPrimaryKeyResponse"}],"description":"Primary keys metadata"},"selectStar":{"description":"SQL select star","type":"string"}},"type":"object","title":"TableMetadataResponseSchema"},"example":{"columns":[],"foreignKeys":[],"indexes":[],"name":"string","primaryKey":{},"selectStar":"string"}}},"description":"Table metadata information"},"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"},"404":{"content":{"application/json":{"schema":{"properties":{"message":{"type":"string"}},"type":"object"},"example":{"message":"Not found: The requested resource does not exist"}}},"description":"Not found"},"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"}}}