fix(xray): synchronize lifecycle state (#6138)

* fix(xray): synchronize lifecycle snapshots

Protect process replacement and result caching with a lifecycle state object, so read paths keep one process snapshot while restarts swap state safely. Bound version probing to prevent a stalled binary from holding the restart lock.

* test(xray): cover concurrent lifecycle reads

Exercise status, result, and traffic reads while the managed process is replaced, so the race detector guards the lifecycle snapshot boundary.

* fix(xray): guard process config snapshots

Synchronize hot-applied config snapshots, keep Telegram reads on one lifecycle snapshot, and strengthen lifecycle timeout and concurrency regression coverage.

---------

Co-authored-by: PathGao <gaoyanbo@gaoyanbodeMacBook-Air.local>

internal/web/service/xray_lifecycle_test.go

@@ -0,0 +1,68 @@
+package service
+
+import (
+	"sync"
+	"testing"
+
+	"github.com/mhsanaei/3x-ui/v3/internal/xray"
+)
+
+func TestXrayLifecycleSnapshotDoesNotOverwriteNewerResult(t *testing.T) {
+	state := xrayLifecycle{}
+	first := xray.NewProcess(&xray.Config{})
+	second := xray.NewProcess(&xray.Config{})
+
+	state.replace(first)
+	state.storeResult(first, "first result")
+	process, result := state.snapshot()
+	if process != first || result != "first result" {
+		t.Fatalf("snapshot = (%p, %q), want (%p, %q)", process, result, first, "first result")
+	}
+	state.replace(second)
+	state.storeResult(first, "old result")
+
+	process, result = state.snapshot()
+	if process != second {
+		t.Fatal("snapshot returned the replaced process")
+	}
+	if result != "" {
+		t.Fatalf("snapshot result = %q, want empty", result)
+	}
+}
+
+func TestXrayLifecycleConcurrentStatusResultAndTrafficReads(t *testing.T) {
+	previousProcess, previousResult := xrayState.snapshot()
+	t.Cleanup(func() {
+		xrayState.mu.Lock()
+		xrayState.process = previousProcess
+		xrayState.result = previousResult
+		xrayState.mu.Unlock()
+	})
+
+	first := xray.NewProcess(&xray.Config{})
+	second := xray.NewProcess(&xray.Config{})
+	service := XrayService{}
+	var wg sync.WaitGroup
+
+	wg.Go(func() {
+		for range 200 {
+			xrayState.replace(first)
+			xrayState.replace(second)
+		}
+	})
+
+	for range 4 {
+		wg.Go(func() {
+			for range 200 {
+				_ = service.IsXrayRunning()
+				_ = service.GetXrayResult()
+				_, _, err := service.GetXrayTraffic()
+				if err == nil || err.Error() != "xray is not running" {
+					t.Errorf("GetXrayTraffic error = %v, want xray is not running", err)
+				}
+			}
+		})
+	}
+
+	wg.Wait()
+}