Patch Changes

• #16922 7dce185 Thanks @astrobot-houston! - Fixes prerendered pages returning 404 when using build.format: 'file' or build.format: 'preserve' with the Node adapter in standalone mode.

  Previously, clean URLs like /about would fail to resolve to about.html on disk, because the static file handler only supported the default directory format (about/index.html). Now the handler correctly resolves clean URLs to .html files when the build format produces them.