feat: add TiDB Cloud Filesystem product navigation and routing

README.md

@@ -37,6 +37,28 @@ In order to debug algolia searches, you need to provide two additional environme
 
 Put them in `.env.development` to make them take effect. (Ref: <https://www.gatsbyjs.com/docs/how-to/local-development/environment-variables/>)
 
+## Filesystem Documentation
+
+TiDB Cloud Filesystem appears after TiDB Cloud Lake in the Product menu. Its
+English documentation is published at `/tidbcloud-filesystem/` with its own
+sidebar and Preview badge.
+
+The source content comes from `pingcap/docs` and is published by
+`pingcap/docs-staging` under
+`markdown-pages/en/tidb-cloud-filesystem/master/`. The staging tree contains
+`tidb-cloud-filesystem/` and `TOC-tidb-cloud-filesystem.md`, and requires a
+separate `tidb-cloud-filesystem` entry in the `pingcap/docs-staging`
+`docs.json`, similar to TiDB Cloud Lake. After the staging submodule is
+updated, that file is available in this checkout as `docs/docs.json`. The
+source pages and staging configuration must reach `docs-staging` before a
+website deployment can publish them. The menu links to English without
+changing the selected Cloud database plan or implying that translated
+Filesystem pages exist.
+
+`gatsby/__tests__/filesystem-routing.test.ts` checks published URLs, sidebar
+selection, TOC membership, and links to the existing AI command reference.
+`gatsby/__tests__/filesystem-header.test.ts` checks menu order and selection.
+
 ## Workflow
 
 Because of most of our text data stored in GitHub. It's needed to apply a GitHub API token in development **when you are prompted for `rate-limiting`**.

gatsby-config.js

@@ -93,7 +93,7 @@ module.exports = {
           {
             matchPath: `/:lang?/(${Object.keys(docs.docs).join(
               "|"
-            )}|developer|best-practices|api|ai|releases|tidbcloudlake)/(.*)`,
+            )}|developer|best-practices|api|ai|releases|tidbcloudlake|tidbcloud-filesystem)/(.*)`,
             getLanguageFromPath: true,
           },
           {