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/rlsrestapi-post.Schema.json

@@ -0,0 +1 @@
+{"schema":{"properties":{"clause":{"description":"clause_description","type":"string"},"description":{"description":"description_description","nullable":true,"type":"string"},"filter_type":{"description":"filter_type_description","enum":["Regular","Base"],"type":"string"},"group_key":{"description":"group_key_description","nullable":true,"type":"string"},"name":{"description":"name_description","maxLength":255,"minLength":1,"type":"string"},"roles":{"description":"roles_description","items":{"type":"integer"},"type":"array"},"tables":{"description":"tables_description","items":{"type":"integer"},"minItems":1,"type":"array"}},"required":["clause","filter_type","name","roles","tables"],"type":"object","title":"RLSRestApi.post"},"schemaType":"response"}