feat(quic): replace probe UDP data plane with QUIC datagrams

backend/shared/MoShiro.Protocol/Rpc/MoShiroRpc.cs

@@ -146,8 +146,11 @@ public sealed class AgentEndpoint
     [JsonPropertyName("tcp_port")]
     public int TcpPort { get; set; }
 
+    [JsonPropertyName("quic_ports")]
+    public List<int> QuicPorts { get; set; } = [];
+
     [JsonPropertyName("udp_ports")]
-    public List<int> UdpPorts { get; set; } = [];
+    public List<int> LegacyUdpPorts { get; set; } = [];
 
     /// <summary>Agent 面向 Probe 的 TLS 证书公钥（SPKI，base64）：证书按它的 SHA-256 指纹固定，敲门密钥由它和 Probe 的身份密钥派生。</summary>
     [JsonPropertyName("public_key")]
@@ -175,8 +178,11 @@ public sealed class AgentEnrollMeta
     [JsonPropertyName("probe_tcp_port")]
     public int ProbeTcpPort { get; set; } = 7443;
 
+    [JsonPropertyName("probe_quic_ports")]
+    public List<int> ProbeQuicPorts { get; set; } = [];
+
     [JsonPropertyName("probe_udp_ports")]
-    public List<int> ProbeUdpPorts { get; set; } = [7443];
+    public List<int>? LegacyProbeUdpPorts { get; set; }
 
     [JsonPropertyName("public_host")]
     public string? PublicHost { get; set; }
@@ -296,6 +302,9 @@ public sealed class UpdateStatus
 /// <summary>Probe 的 <c>fleet.heartbeat</c> 附加字段：更新器的状态。</summary>
 public sealed class ProbeHeartbeatExtra
 {
+    [JsonPropertyName("quic_links")]
+    public List<ProbeQuicLinkHealth>? QuicLinks { get; set; }
+
     [JsonPropertyName("ipv6")]
     public Ipv6Diagnostic? Ipv6 { get; set; }
 
@@ -303,6 +312,53 @@ public sealed class ProbeHeartbeatExtra
     public UpdateStatus? Update { get; set; }
 }
 
+/// <summary>Probe's rolling QUIC connection health snapshot for one Agent/IP path.</summary>
+public sealed class ProbeQuicLinkHealth
+{
+    [JsonPropertyName("agent_id")]
+    public string AgentId { get; set; } = "";
+
+    [JsonPropertyName("ip_version")]
+    public string IpVersion { get; set; } = IpVersions.V4;
+
+    [JsonPropertyName("connected")]
+    public bool Connected { get; set; }
+
+    [JsonPropertyName("handshake_attempts")]
+    public long HandshakeAttempts { get; set; }
+
+    [JsonPropertyName("handshake_successes")]
+    public long HandshakeSuccesses { get; set; }
+
+    [JsonPropertyName("handshake_failures")]
+    public long HandshakeFailures { get; set; }
+
+    [JsonPropertyName("handshake_timeouts")]
+    public long HandshakeTimeouts { get; set; }
+
+    [JsonPropertyName("handshake_p95_ms")]
+    public double? HandshakeP95Ms { get; set; }
+
+    [JsonPropertyName("handshake_sample_count")]
+    public long HandshakeSampleCount { get; set; }
+
+    /// <summary>QUIC packet-loss estimate from MsQuic's non-spurious loss counters; not Datagram application loss or retransmission.</summary>
+    [JsonPropertyName("transport_packet_loss_rate")]
+    public double? TransportPacketLossRate { get; set; }
+
+    [JsonPropertyName("transport_packets_sent")]
+    public ulong? TransportPacketsSent { get; set; }
+
+    [JsonPropertyName("transport_congestion_events")]
+    public uint? TransportCongestionEvents { get; set; }
+
+    [JsonPropertyName("transport_ecn_congestion_events")]
+    public uint? TransportEcnCongestionEvents { get; set; }
+
+    [JsonPropertyName("path_mtu")]
+    public ushort? PathMtu { get; set; }
+}
+
 /// <summary>Probe 的 <c>fleet.hello</c> 附加字段：系统、架构和构建信息（只用于展示和更新）。</summary>
 public sealed class ProbeHelloMeta
 {
@@ -345,8 +401,11 @@ public sealed class AgentHelloMeta
     [JsonPropertyName("probe_tcp_port")]
     public int? ProbeTcpPort { get; set; }
 
+    [JsonPropertyName("probe_quic_ports")]
+    public List<int>? ProbeQuicPorts { get; set; }
+
     [JsonPropertyName("probe_udp_ports")]
-    public List<int>? ProbeUdpPorts { get; set; }
+    public List<int>? LegacyProbeUdpPorts { get; set; }
 
     [JsonPropertyName("local_limits")]
     public LocalLimits? LocalLimits { get; set; }
@@ -482,8 +541,11 @@ public sealed class LineTaskSet
     public List<LineTask> Tasks { get; set; } = [];
 
     /// <summary>Agent 的数据面端口（Probe 把包发到这里）。</summary>
+    [JsonPropertyName("quic_ports")]
+    public List<int> QuicPorts { get; set; } = [];
+
     [JsonPropertyName("udp_ports")]
-    public List<int> UdpPorts { get; set; } = [];
+    public List<int> LegacyUdpPorts { get; set; } = [];
 
     [JsonPropertyName("tcp_ports")]
     public List<int> TcpPorts { get; set; } = [];