shared: add independent IPv4 and IPv6 collection [CI]

backend/tests/MoShiro.Backend.Tests/HostTests.cs

@@ -30,7 +30,7 @@ public sealed class HostSamplerTests
         var time = new Microsoft.Extensions.Time.Testing.FakeTimeProvider();
         string stat = Stat1;
         string dev = Dev1;
-        var sampler = new HostSampler(time, path => path switch { "/proc/stat" => stat, "/proc/net/dev" => dev, "/proc/uptime" => "100.0 1.0", _ => null }, () => (1000, 250), procRoot: "/proc", sysRoot: "/sys");
+        var sampler = new HostSampler(time, path => path.Replace('\\', '/') switch { "/proc/stat" => stat, "/proc/net/dev" => dev, "/proc/uptime" => "100.0 1.0", _ => null }, () => (1000, 250), procRoot: "/proc", sysRoot: "/sys");
         HostSnapshot first = sampler.Sample();
         Assert.Null(first.CpuPercent); // 第一次没有基线
         Assert.Null(first.NetRxBps);
@@ -53,6 +53,7 @@ public sealed class HostSamplerTests
         var reads = new List<string>();
         var sampler = new HostSampler(TimeProvider.System, path =>
         {
+            path = path.Replace('\\', '/'); // 测试里的 /proc 格式统一用斜杠，兼容 Windows 的 Path.Combine
             reads.Add(path);
             return path switch
             {