Release 3.8.1.1: lighter idle UI poll, core cache, multicore ping.

Reduce idle CPU (cheap PollUI, binary cache, logbuf cap, DOM fingerprint),
speed ping/AWG HostPort, CopyBuffer pool; ship arm64 build and update notes.

Co-authored-by: Cursor <cursoragent@cursor.com>

cmd/vpnapp/main_darwin.go

@@ -3,13 +3,13 @@
 package main
 
 import (
-	"bytes"
 	"fmt"
 	"log"
 	"net/http"
 	"os"
 	"os/exec"
 	"os/signal"
+	"runtime"
 	"syscall"
 	"time"
 
@@ -18,6 +18,7 @@ import (
 	"vpnclient/internal/apphost"
 	"vpnclient/internal/config"
 	"vpnclient/internal/core"
+	"vpnclient/internal/logbuf"
 	"vpnclient/internal/update"
 )
 
@@ -27,6 +28,7 @@ func main() {
 	}
 	update.CleanupStaleDownloads()
 	log.SetFlags(log.LstdFlags | log.Lshortfile)
+	log.Printf("Navis %s · GOMAXPROCS=%d NumCPU=%d", update.DisplayVersion(), runtime.GOMAXPROCS(0), runtime.NumCPU())
 
 	cfgPath, err := config.LocateConfig()
 	if err != nil {
@@ -41,7 +43,7 @@ func main() {
 	if err != nil {
 		fatalf("Ошибка конфига %s: %v", cfgPath, err)
 	}
-	logBuf := &bytes.Buffer{}
+	logBuf := logbuf.New(0)
 	mgr, err := core.NewManager(cfgPath, cfg, logBuf)
 	if err != nil {
 		fatalf("%v", err)

cmd/vpnapp/main_windows.go

@@ -3,11 +3,11 @@
 package main
 
 import (
-	"bytes"
 	"fmt"
 	"log"
 	"os"
 	"path/filepath"
+	"runtime"
 	"time"
 	"unsafe"
 
@@ -18,6 +18,7 @@ import (
 	"vpnclient/internal/appui"
 	"vpnclient/internal/config"
 	"vpnclient/internal/core"
+	"vpnclient/internal/logbuf"
 	"vpnclient/internal/update"
 )
 
@@ -28,6 +29,7 @@ func main() {
 	update.CleanupStaleDownloads()
 
 	log.SetFlags(log.LstdFlags | log.Lshortfile)
+	log.Printf("Navis %s · GOMAXPROCS=%d NumCPU=%d", update.DisplayVersion(), runtime.GOMAXPROCS(0), runtime.NumCPU())
 
 	cfgPath, err := config.LocateConfig()
 	if err != nil {
@@ -44,7 +46,7 @@ func main() {
 		fatalDialog("Ошибка конфига %s: %v", cfgPath, err)
 	}
 
-	logBuf := &bytes.Buffer{}
+	logBuf := logbuf.New(0)
 	mgr, err := core.NewManager(cfgPath, cfg, logBuf)
 	if err != nil {
 		fatalDialog("%v", err)