feat: daily node restart controlled from the admin, connect timings as a default line task [CI]

Agents and Probes exit in order at a configured time (default 04:30 UTC+8, switch and time zone in the admin settings) and the service manager starts them again; a local restart_at or MOSHIRO_RESTART_AT wins. The connect kind (TCP connect and TLS handshake timings) is now a default continuous line template, with a section on the line page.

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

@@ -88,16 +88,19 @@ public sealed class AgentHarness : IAsyncDisposable
     public async Task OverrideLineTasksAsync(int? rateHz = null)
     {
         JsonNode tasks = await Backend.GetJsonAsync(Backend.Admin, "/api/admin/tasks");
-        foreach (JsonNode? task in tasks["items"]!.AsArray())
+        // 先处理 connect（关掉），再改 udp_echo / tcp_echo 的速率：否则中途的带宽预算会多出 connect 那一份
+        foreach (JsonNode? task in tasks["items"]!.AsArray().OrderBy(t => t!["kind"]!.GetValue<string>() == "connect" ? 0 : 1))
         {
-            if (task!["scope"]!.GetValue<string>() != "line" || task["agent_id"] is not null || task["kind"]!.GetValue<string>() is not ("udp_echo" or "tcp_echo"))
+            if (task!["scope"]!.GetValue<string>() != "line" || task["agent_id"] is not null || task["kind"]!.GetValue<string>() is not ("udp_echo" or "tcp_echo" or "connect"))
             {
                 continue;
             }
 
             string kind = task["kind"]!.GetValue<string>();
             var parameters = new JsonObject { ["port"] = kind == "udp_echo" ? App.UdpPorts[0] : App.TcpPorts[0] };
-            if (rateHz is { } hz)
+            // 默认的 connect 模板在这些用例里不需要（也占预算）：对这个 Agent 关掉它
+            bool enabled = kind != "connect";
+            if (rateHz is { } hz && kind != "connect")
             {
                 parameters["rate_hz"] = hz;
             }
@@ -109,6 +112,7 @@ public sealed class AgentHarness : IAsyncDisposable
                 ["agent_id"] = Id,
                 ["base_task_id"] = task["id"]!.GetValue<string>(),
                 ["params"] = parameters,
+                ["enabled"] = enabled,
             }));
             Assert.True(created.StatusCode == System.Net.HttpStatusCode.Created, await created.Content.ReadAsStringAsync());
         }