test(02-01): add failing test for the presentations prefix

- /_presentations must be a plain 404, not the SPA shell
- A router without the presentations plugin has no public document route

static_test.go

@@ -113,6 +113,7 @@ func TestStaticReservedPaths(t *testing.T) {
 	h := handler(t, "/bmadmin")
 	for _, p := range []string{
 		"/_user", "/_user/", "/_user/api/v1/nope", "/_bm/api/v1/nope", "/_quizzes/api/v1/nope",
+		"/_presentations", "/_presentations/api/v1/nope",
 		"/bmadmin", "/bmadmin/", "/bmadmin/login", "/storage/app/uploads/public/x.pdf",
 		"/storage", "/_user/../_user/x", "//_bm/api",
 	} {