docs(nodejs): clarify serveStatic root path resolution (#837)

* docs(nodejs): clarify serveStatic root path resolution and add import.meta.url exampleEnhance Node.js docs with path resolution guidance

Add warning about path resolution in Node.js static serving

* ci: apply automated fixes

---------

Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>

Fixies honojs/hono#4442

Author: ramanverse

docs/getting-started/nodejs.md

@@ -180,6 +180,23 @@ import { serveStatic } from '@hono/node-server/serve-static'
 app.use('/static/*', serveStatic({ root: './' }))
 ```
 
+::: warning
+The `root` option resolves paths relative to the current working directory (`process.cwd()`). This means the behavior depends on **where you run your Node.js process from**, not where your source file is located. If you start your server from a different directory, file resolution may fail.
+
+For reliable path resolution that always points to the same directory as your source file, use `import.meta.url`:
+
+```ts
+import { fileURLToPath } from 'node:url'
+import { serveStatic } from '@hono/node-server/serve-static'
+
+app.use(
+  '/static/*',
+  serveStatic({ root: fileURLToPath(new URL('./', import.meta.url)) })
+)
+```
+
+:::
+
 Use the `path` option to serve `favicon.ico` in the directory root:
 
 ```ts