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/schemas/queryresult.Schema.json

@@ -0,0 +1 @@
+{"schema":{"properties":{"changed_on":{"format":"date-time","type":"string"},"ctas":{"type":"boolean"},"db":{"type":"string"},"dbId":{"type":"integer"},"endDttm":{"type":"number"},"errorMessage":{"nullable":true,"type":"string"},"executedSql":{"type":"string"},"extra":{"type":"object"},"id":{"type":"string"},"limit":{"type":"integer"},"limitingFactor":{"type":"string"},"progress":{"type":"integer"},"queryId":{"type":"integer"},"resultsKey":{"type":"string"},"rows":{"type":"integer"},"schema":{"type":"string"},"serverId":{"type":"integer"},"sql":{"type":"string"},"sqlEditorId":{"type":"string"},"startDttm":{"type":"number"},"state":{"type":"string"},"tab":{"type":"string"},"tempSchema":{"nullable":true,"type":"string"},"tempTable":{"nullable":true,"type":"string"},"trackingUrl":{"nullable":true,"type":"string"},"user":{"type":"string"},"userId":{"type":"integer"}},"type":"object","title":"QueryResult"},"schemaType":"response"}