Allow disabling `serve-static` middleware

Editor assessment

The subject states both the new capability and its switch — disabling the `serve-static` middleware — so the header communicates the feature without the diff, and feat(server) classifies and locates it correctly. The closes #9362 footer is well formed and ties the feature to the requesting issue, exactly what footers are for. Hygiene is clean: imperative mood, no trailing period, sensible length. No body is present, a tolerable gap for a small opt-in flag, though a line on when to disable static serving would add value. A good, publishable example.