feat(runtime): track node lifecycle and QUIC link state

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

@@ -48,6 +48,7 @@ public sealed class ProbeEndToEndTests : IClassFixture<BackendFixture>
 
         // 直连面板：在线，hello 里的系统、架构和版本都被记下来了
         await BackendFixture.EventuallyAsync(async () => (await _backend.GetJsonAsync(_backend.Admin, path))["online"]!.GetValue<bool>(), because: "the probe links to the panel");
+        await BackendFixture.EventuallyAsync(async () => (await _backend.GetJsonAsync(_backend.Admin, path))["runtime_status"]!.GetValue<string>() == "probe_paused", because: "a Probe without any enabled Agent endpoints reports paused probing");
         await BackendFixture.EventuallyAsync(
             async () => (await _backend.GetJsonAsync(_backend.Anonymous, "/api/public/nodes"))["items"]!.AsArray().Any(n => n!["id"]!.GetValue<string>() == probe.ProbeId && n["os"] is not null && n["arch"] is not null),
             because: "the platform comes from the probe's own hello");
@@ -58,6 +59,7 @@ public sealed class ProbeEndToEndTests : IClassFixture<BackendFixture>
         await BackendFixture.EventuallyAsync(async () =>
             !(await _backend.GetJsonAsync(_backend.Admin, path))["online"]!.GetValue<bool>() && !probe.App.Link.IsConnected,
             because: "a revoked probe is disconnected and cannot come back");
+        Assert.Equal("maintenance", (await _backend.GetJsonAsync(_backend.Admin, path))["runtime_status"]!.GetValue<string>());
     }
 
     [Fact]