perf(tests): isolate network E2E and await QUIC cleanup

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

@@ -20,7 +20,7 @@ public sealed class AotSmokeTests
     {
         Assert.SkipUnless(Url is not null, "set MOSHIRO_AOT_URL to the address of a running NativeAOT build to run this test");
         var baseAddress = new Uri(Url!);
-        using var http = new HttpClient { BaseAddress = baseAddress };
+        using var http = new HttpClient { BaseAddress = baseAddress, Timeout = TimeSpan.FromSeconds(15) };
 
         // 管理员：登录 → 令牌
         using HttpResponseMessage login = await http.PostAsync("/api/admin/auth/login", BackendFixture.Json(new JsonObject { ["username"] = BackendFixture.AdminUser, ["password"] = BackendFixture.AdminPassword }));
@@ -41,7 +41,7 @@ public sealed class AotSmokeTests
         using HttpResponseMessage probeJoin = await http.PostAsync("/api/admin/join-tokens", BackendFixture.Json(new JsonObject { ["role"] = "probe", ["max_uses"] = 1 }));
         probeJoin.EnsureSuccessStatusCode();
         string probeToken = JsonNode.Parse(await probeJoin.Content.ReadAsStringAsync())!["plaintext"]!.GetValue<string>();
-        using var probeHttp = new HttpClient();
+        using var probeHttp = new HttpClient { Timeout = TimeSpan.FromSeconds(15) };
         Fleet.Core.Result<Fleet.Enrollment.Client.EnrollmentResult> probeEnrolled = await Fleet.Enrollment.Client.EnrollmentClient.EnrollAsync(
             probeHttp, baseAddress, probeToken, "aot-probe-" + Guid.NewGuid().ToString("N")[..6], Path.Combine(Path.GetTempPath(), "moshiro-aot-probe-" + Guid.NewGuid().ToString("N")), "0.0.0", null, TimeProvider.System, default);
         Assert.True(probeEnrolled.IsSuccess, probeEnrolled.IsSuccess ? "" : probeEnrolled.Error.ToString());
@@ -51,7 +51,7 @@ public sealed class AotSmokeTests
         using HttpResponseMessage joinResponse = await http.PostAsync("/api/admin/join-tokens", BackendFixture.Json(new JsonObject { ["max_uses"] = 1 }));
         joinResponse.EnsureSuccessStatusCode();
         string joinToken = JsonNode.Parse(await joinResponse.Content.ReadAsStringAsync())!["plaintext"]!.GetValue<string>();
-        using var anonymous = new HttpClient { BaseAddress = baseAddress };
+        using var anonymous = new HttpClient { BaseAddress = baseAddress, Timeout = TimeSpan.FromSeconds(15) };
         await using AgentSimulator agent = await AgentSimulator.EnrollAsync(anonymous, joinToken, "aot-" + Guid.NewGuid().ToString("N")[..6]);
         agent.ProbeForChunks = new ProbeId(probeId);
         string lineId = $"{agent.NodeId.Value}~{probeId}";