fix: Handle OPTIONS requests for CORS preflight #637
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Fixes CORS preflight OPTIONS requests returning 404 for API endpoints.
The previous CORS middleware in #629 worked fine for registered routes, but I missed that OPTIONS requests were hitting 404 before the middleware could handle them. This happens because Gorilla Mux returns 404 when no route matches the HTTP method.
Added a catch-all OPTIONS handler so all API endpoints can receive CORS preflight requests properly.
My bad for not testing this thoroughly in the first PR!