feat: detect an agent's public IPv4 and IPv6 addresses automatically, manual values still win [CI]

backend/tests/MoShiro.TestSupport/AgentSimulator.cs

@@ -139,12 +139,16 @@ public sealed class AgentSimulator : IAsyncDisposable
         }
     }
 
+    /// <summary>hello 里上报的本机公网地址（缺省不上报）。</summary>
+    public string[]? Addresses { get; set; }
+
     public async Task HelloAsync(string[]? kinds = null)
     {
         var meta = JsonSerializer.SerializeToElement(
             new AgentHelloMeta
             {
                 TlsSpki = Convert.ToBase64String(RandomNumberGenerator.GetBytes(32)),
+                Addresses = Addresses is null ? null : [.. Addresses],
                 ProbeTcpPort = 7443,
                 ProbeUdpPorts = [7443],
                 LocalLimits = new LocalLimits { MaxTotalMbps = 200, MaxTotalPps = 20_000, MaxConcurrentTests = 1 },