do log throughput and requests. Also add throughput to the log entries

proxy/internal/accesslog/statuswriter.go

@@ -4,15 +4,22 @@ import (
 	"github.com/netbirdio/netbird/proxy/internal/responsewriter"
 )
 
-// statusWriter captures the HTTP status code from WriteHeader calls.
+// statusWriter captures the HTTP status code and bytes written from responses.
 // It embeds responsewriter.PassthroughWriter which handles all the optional
 // interfaces (Hijacker, Flusher, Pusher) automatically.
 type statusWriter struct {
 	*responsewriter.PassthroughWriter
-	status int
+	status       int
+	bytesWritten int64
 }
 
 func (w *statusWriter) WriteHeader(status int) {
 	w.status = status
 	w.PassthroughWriter.WriteHeader(status)
 }
+
+func (w *statusWriter) Write(b []byte) (int, error) {
+	n, err := w.PassthroughWriter.Write(b)
+	w.bytesWritten += int64(n)
+	return n, err
+}