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/export-all-assets.api.mdx

@@ -0,0 +1,60 @@
+---
+id: export-all-assets
+title: "Export all assets"
+description: "Gets a ZIP file with all the Superset assets (databases, datasets, charts, dashboards, saved queries) as YAML files."
+sidebar_label: "Export all assets"
+hide_title: true
+hide_table_of_contents: true
+api: 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
+sidebar_class_name: "get api-method"
+info_path: developer-docs/api/superset
+custom_edit_url: null
+hide_send_button: true
+show_extensions: true
+---
+
+import MethodEndpoint from "@theme/ApiExplorer/MethodEndpoint";
+import ParamsDetails from "@theme/ParamsDetails";
+import RequestSchema from "@theme/RequestSchema";
+import StatusCodes from "@theme/StatusCodes";
+import OperationTabs from "@theme/OperationTabs";
+import TabItem from "@theme/TabItem";
+import Heading from "@theme/Heading";
+import Translate from "@docusaurus/Translate";
+
+<Heading
+  as={"h1"}
+  className={"openapi__heading"}
+  children={"Export all assets"}
+>
+</Heading>
+
+<MethodEndpoint
+  method={"get"}
+  path={"/api/v1/assets/export/"}
+  context={"endpoint"}
+>
+
+</MethodEndpoint>
+
+
+
+Gets a ZIP file with all the Superset assets (databases, datasets, charts, dashboards, saved queries) as YAML files.
+
+<ParamsDetails
+  parameters={undefined}
+>
+
+</ParamsDetails>
+
+<RequestSchema
+  {...require("./export-all-assets.RequestSchema.json")}
+>
+
+</RequestSchema>
+
+<StatusCodes
+  {...require("./export-all-assets.StatusCodes.json")}
+>
+
+</StatusCodes>