Fix regression: access log template, gitea manager cli command (#24838)

Close #24836

![image](95b025d2-f25f-4246-a08a-fe44ecb787a9)

![image](c3afe1fa-2a23-420d-a016-3b67dcd04cd5)

modules/context/response.go

@@ -13,6 +13,7 @@ type ResponseWriter interface {
 	http.Flusher
 	Status() int
 	Before(func(ResponseWriter))
+	Size() int // used by access logger template
 }
 
 var _ ResponseWriter = &Response{}
@@ -45,6 +46,10 @@ func (r *Response) Write(bs []byte) (int, error) {
 	return size, nil
 }
 
+func (r *Response) Size() int {
+	return r.written
+}
+
 // WriteHeader write status code
 func (r *Response) WriteHeader(statusCode int) {
 	if !r.beforeExecuted {