chabged.进一步清理启动器内的更新逻辑

LanMountainDesktop.Tests/HostStartupMonitorTests.cs

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+using LanMountainDesktop.Launcher.Startup;
+using LanMountainDesktop.Shared.Contracts.Launcher;
+using LanMountainDesktop.Shared.IPC.Abstractions.Services;
+using Xunit;
+
+namespace LanMountainDesktop.Tests;
+
+public sealed class HostStartupMonitorTests
+{
+    [Fact]
+    public void InitialIpcConnectUsesStagedBackoff()
+    {
+        var source = ReadRepositoryFile("LanMountainDesktop.Launcher", "Startup", "HostStartupMonitor.cs");
+
+        Assert.Contains("StartupTimeoutPolicy.InitialIpcConnectTimeout", source);
+        Assert.Contains("TimeSpan.FromMilliseconds(3000)", source);
+        Assert.Contains("TimeSpan.FromMilliseconds(5000)", source);
+        Assert.Contains("TryConnectWithBackoffAsync", source);
+    }
+
+    [Fact]
+    public void RefreshShellStatus_UsesStartupSuccessTrackerForSuccess()
+    {
+        var source = ReadRepositoryFile("LanMountainDesktop.Launcher", "Startup", "HostStartupMonitor.cs");
+
+        Assert.Contains("SuccessTracker.TryResolve(shellStatus, out var successState)", source);
+        var refreshBlock = source[
+            source.IndexOf("RefreshShellStatusAsync", StringComparison.Ordinal) ..
+            source.IndexOf("var connected = await PublicIpcConnection.TryConnectWithBackoffAsync", StringComparison.Ordinal)];
+        Assert.DoesNotContain("return new StartupSuccessState", refreshBlock);
+        Assert.DoesNotContain("successState = new StartupSuccessState", refreshBlock);
+    }
+
+    [Fact]
+    public void BuildDelayedLoadingState_AddsSoftTimeoutItem()
+    {
+        var loadingState = new LoadingStateMessage
+        {
+            ActiveItems = [],
+            OverallProgressPercent = 0,
+            TotalCount = 0
+        };
+
+        var delayed = HostStartupMonitor.BuildDelayedLoadingState(
+            loadingState,
+            "Still starting",
+            "Host is still warming up.",
+            DateTimeOffset.UtcNow);
+
+        Assert.Equal("Still starting", delayed.Message);
+        Assert.Contains(delayed.ActiveItems, item => item.Id == "launcher-soft-timeout");
+    }
+
+    private static string ReadRepositoryFile(params string[] pathParts)
+    {
+        var directory = new DirectoryInfo(AppContext.BaseDirectory);
+        while (directory is not null && !File.Exists(Path.Combine(directory.FullName, "LanMountainDesktop.slnx")))
+        {
+            directory = directory.Parent;
+        }
+
+        if (directory is null)
+        {
+            throw new DirectoryNotFoundException("Unable to locate repository root.");
+        }
+
+        return File.ReadAllText(Path.Combine([directory.FullName, .. pathParts]));
+    }
+}