feat!: probes generate their own keys and enroll with a join token; node and peer keys are separate [CI]

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

@@ -64,6 +64,11 @@ public sealed record JoinTokenInfo(
     int Uses,
     long ExpiresAtMs,
     long? RevokedAtMs,
-    long CreatedAtMs);
+    long CreatedAtMs,
+    string Kind = "");
 
-public sealed record ProbeRecord(string Id, string Name, byte[] PublicKey, long CreatedAtMs, long? RevokedAtMs, string? Ipv6DiagnosticsJson = 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);