Use MarkLongPolling instead of hard-coded route path (#37427)

modules/web/types/premiddleware.go

@@ -0,0 +1,13 @@
+// Copyright 2026 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package types
+
+import "net/http"
+
+// PreMiddlewareProvider is a special middleware provider which will be executed
+// before other middlewares on the same "routing" level (AfterRouting/Group/Methods/Any, but not BeforeRouting).
+// A route can do something (e.g.: set middleware options) at the place where it is declared,
+// and the code will be executed before other middlewares which are added before the declaration.
+// Use cases: mark a route with some meta info, set some options for middlewares, etc.
+type PreMiddlewareProvider func(next http.Handler) http.Handler