feat: record who created join codes and who added each node [CI]

backend/src/MoShiro.Backend.Application/Models/AgentModels.cs

@@ -29,7 +29,8 @@ public sealed record AgentRecord(
     bool PublicHostManual = false,
     bool Ipv6HostManual = false,
     IReadOnlyList<string>? ReportedAddresses = null,
-    byte[]? TlsPublicKey = null);
+    byte[]? TlsPublicKey = null,
+    string? AddedBy = null);
 
 /// <summary>管理员可以修改的字段（merge-patch 语义：为 null 的字段不改）。</summary>
 public sealed class AgentPatch
@@ -76,10 +77,11 @@ public sealed record JoinTokenInfo(
     long ExpiresAtMs,
     long? RevokedAtMs,
     long CreatedAtMs,
-    string Kind = "");
+    string Kind = "",
+    string? CreatedBy = null);
 
 /// <summary>
 /// <see cref="PublicKey"/> 是连 Backend 的身份公钥，<see cref="PeerPublicKey"/> 是对等面（连 Agent）的公钥，两把是节点自己生成的独立密钥；
 /// Agent 的 <c>peers</c> 里放的是后者。
 /// </summary>
-public sealed record ProbeRecord(string Id, string Name, byte[] PublicKey, long CreatedAtMs, long? RevokedAtMs, string? Ipv6DiagnosticsJson = null, byte[]? PeerPublicKey = null);
+public sealed record ProbeRecord(string Id, string Name, byte[] PublicKey, long CreatedAtMs, long? RevokedAtMs, string? Ipv6DiagnosticsJson = null, byte[]? PeerPublicKey = null, string? AddedBy = null);