修复 frpc restartProcess 发布未初始化 exec.Cmd 的数据竞争：proc.Cmd/Status 改为 Start 成功后加锁发布

Result: {"status":"keep","total_issues":8,"eslint_errors":0,"eslint_problems":0,"eslint_warnings":0,"golint_canonicalheader":0,"golint_errname":0,"golint_errorlint":1,"golint_exhaustive":0,"golint_forcetypeassert":0,"golint_gosec":0,"golint_intrange":0,"golint_modernize":3,"golint_nilnil":3,"golint_perfsprint":0,"golint_prealloc":0,"golint_recvcheck":1,"golint_test_testifylint":0,"golint_test_thelper":0,"golint_test_total":0,"golint_test_usetesting":0,"golint_total":8,"golint_usestdlibvars":0,"golint_vetx_total":0,"golint_wastedassign":0,"measure_s":75,"tsc_errors":0,"vitest_failed":0,"vitest_total":126}

internal/apps/flared/frpc/manager.go

@@ -210,14 +210,15 @@ func (m *Manager) restartProcess(ctx context.Context, relayID string, configPath
 				return syscall.Kill(-cmd.Process.Pid, syscall.SIGKILL)
 			}
 
-			m.mu.Lock()
-			proc.Cmd = cmd
-			proc.Status = "running"
-			m.mu.Unlock()
-
 			startedAt := time.Now()
 			err := cmd.Start()
 			if err == nil {
+				// Start 成功后才发布句柄：Start 之前 cmd.Process 尚未赋值，
+				// 提前挂到 proc.Cmd 会让读者（测试/状态接口）与 Start 竞争。
+				m.mu.Lock()
+				proc.Cmd = cmd
+				proc.Status = "running"
+				m.mu.Unlock()
 				_ = os.WriteFile(pidPath, fmt.Appendf(nil, "%d", cmd.Process.Pid), frpcConfigFilePerm)
 				err = cmd.Wait()
 			}