Refactor names (#31405)

This PR only does "renaming":

* `Route` should be `Router` (and chi router is also called "router")
* `Params` should be `PathParam` (to distingush it from URL query param, and to match `FormString`)
* Use lower case for private functions to avoid exposing or abusing

tests/e2e/e2e_test.go

@@ -28,7 +28,7 @@ import (
 	"code.gitea.io/gitea/tests"
 )
 
-var testE2eWebRoutes *web.Route
+var testE2eWebRoutes *web.Router
 
 func TestMain(m *testing.M) {
 	defer log.GetManager().Close()