shared: add independent IPv4 and IPv6 collection [CI]

backend/agent/src/MoShiro.Agent/AgentConfig.cs

@@ -46,7 +46,7 @@ public sealed class FleetSection
 public sealed class ListenSection
 {
     [JsonPropertyName("bind")]
-    public string Bind { get; set; } = "0.0.0.0";
+    public string Bind { get; set; } = "::";
 
     /// <summary>Probe 控制通道（TLS，点对点会话）。</summary>
     [JsonPropertyName("control_port")]