docs: cut 6.1.0 versions for docs, admin_docs, developer_docs, components

- Snapshot all four versioned docs sections at v6.1.0; master continues to
  serve as "Next" (lastVersion: current, banner: unreleased) so editing
  master keeps updating the canonical URLs
- Enable the previously-disabled components plugin and version it
- Rename stale "developer_portal" references to "developer_docs" across
  package.json scripts, manage-versions.mjs, theme files (DocVersionBadge,
  DocVersionBanner), DOCS_CLAUDE.md, and README.md (URL backward-compat
  redirect /developer_portal/* preserved)
- Add admin_docs version scripts; drop dead "tutorials" plugin id from
  the version badge
- Generalize fixVersionedImports in manage-versions.mjs to walk every
  section's snapshot and rewrite ../../src/ and ../../data/ imports,
  catching admin_docs and components files that previous version cuts
  would have broken
- Remove orphan files: developer_portal_versions.json,
  tutorials_versions.json, and stray empty versions.json files inside
  components/ and developer_docs/ content directories

docs/developer_docs_versioned_docs/version-6.1.0/api/get-dashboards-tabs.StatusCodes.json

@@ -0,0 +1 @@
+{"responses":{"200":{"content":{"application/json":{"schema":{"properties":{"result":{"items":{"properties":{"all_tabs":{"additionalProperties":{"type":"string"},"type":"object"},"tab_tree":{"items":{"properties":{"children":{"items":"circular(Tab)","type":"array"},"parents":{"items":{"type":"string"},"type":"array"},"title":{"type":"string"},"value":{"type":"string"}},"type":"object","title":"Tab"},"type":"array"}},"type":"object","title":"TabsPayloadSchema"},"type":"object"}},"type":"object"},"example":{"result":{}}}},"description":"Dashboard tabs"},"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"},"403":{"content":{"application/json":{"schema":{"properties":{"message":{"type":"string"}},"type":"object"},"example":{"message":"Forbidden: You don't have permission to access this resource"}}},"description":"Forbidden"},"404":{"content":{"application/json":{"schema":{"properties":{"message":{"type":"string"}},"type":"object"},"example":{"message":"Not found: The requested resource does not exist"}}},"description":"Not found"}}}