agent: unify listening and dialing with directed mutual measurements

Replace Probe with Agent across node runtime, Fleet contracts, backend state, API and storage. Report incoming sessions and outgoing link health through each Agent uplink, and retain directed link controls and retry.

Update protocol fixtures and end-to-end coverage for the unified model; accept requested cancellation during the Fleet timeout test cleanup.

backend/shared/MoShiro.Protocol/Catalog/Kinds/Kinds.cs

@@ -12,9 +12,9 @@ public static class Kinds
         "msg",
         [
             Col.Seq("seq"), Col.U16("size"),
-            Col.TsProbe("t1"), Col.TsAgent("t2", nullable: true), Col.TsAgent("t3", nullable: true), Col.TsProbe("t4", nullable: true),
+            Col.TsDialer("t1"), Col.TsListener("t2", nullable: true), Col.TsListener("t3", nullable: true), Col.TsDialer("t4", nullable: true),
         ],
-        Side.Probe,
+        Side.Dialer,
         "seq");
 
     private static readonly StreamSpec s_tcpInfo = new(
@@ -43,7 +43,7 @@ public static class Kinds
     public static readonly KindSpec UdpTrain = new(
         "udp_train",
         "QUIC Datagram train",
-        "Fixed-rate or laddered one-way QUIC Datagram stream (Agent to Probe) for loss and delay variation under load.",
+        "Fixed-rate or laddered one-way QUIC Datagram stream (Agent to 拨号方) for loss and delay variation under load.",
         Scope.Line,
         new BlockSet("quic_datagram", "ladder", "fixed", "sink", []),
         [
@@ -54,8 +54,8 @@ public static class Kinds
             P.Int("port", 7443, 1, 65535),
         ],
         [
-            new StreamSpec("pkt", [Col.Seq("seq"), Col.U16("size"), Col.TsAgent("t_send"), Col.TsProbe("t_recv", nullable: true)], Side.Agent, "seq"),
-            new StreamSpec("step", [Col.U16("index"), Col.U32("mbps"), Col.TsProbe("start_ts"), Col.TsProbe("end_ts")]),
+            new StreamSpec("pkt", [Col.Seq("seq"), Col.U16("size"), Col.TsListener("t_send"), Col.TsDialer("t_recv", nullable: true)], Side.Listener, "seq"),
+            new StreamSpec("step", [Col.U16("index"), Col.U32("mbps"), Col.TsDialer("start_ts"), Col.TsDialer("end_ts")]),
         ],
         p => (long)(p.GetNumber("mbps") * 1_000_000));
 
@@ -91,7 +91,7 @@ public static class Kinds
             P.Bool("tls", true),
         ],
         [
-            new StreamSpec("bytes", [Col.TsProbe("ts"), Col.U8("conn"), Col.U64("bytes")]),
+            new StreamSpec("bytes", [Col.TsDialer("ts"), Col.U8("conn"), Col.U64("bytes")]),
             s_tcpInfo,
         ],
         _ => 0);
@@ -111,7 +111,7 @@ public static class Kinds
         [
             new StreamSpec(
                 "conn",
-                [Col.Seq("attempt"), Col.TsProbe("ts"), Col.U32("tcp_us", nullable: true), Col.U32("tls_us", nullable: true), Col.U8("outcome")]),
+                [Col.Seq("attempt"), Col.TsDialer("ts"), Col.U32("tcp_us", nullable: true), Col.U32("tls_us", nullable: true), Col.U8("outcome")]),
         ],
         p => p.GetInt("per_minute") * 4000 / 60);
 
@@ -126,14 +126,14 @@ public static class Kinds
             P.Int("port", 7444, 1, 65535),
         ],
         [
-            new StreamSpec("hold", [Col.TsProbe("ts"), Col.U8("event"), Col.U32("lifetime_ms")]),
+            new StreamSpec("hold", [Col.TsDialer("ts"), Col.U8("event"), Col.U32("lifetime_ms")]),
         ],
         p => 2000 / Math.Max(1, p.GetInt("heartbeat_s")) * 8);
 
     public static readonly KindSpec IcmpEcho = new(
         "icmp_echo",
         "ICMP echo",
-        "Probe or Agent side ICMP echo to a target address.",
+        "拨号方 or Agent side ICMP echo to a target address.",
         Scope.Target,
         new BlockSet("icmp", "fixed", "fixed", "echo", []),
         [