feat: the node itself requires an owner passkey (shared by agent and probe) and reports it; the panel derives the account and passkey it is bound to [CI]

backend/probe/src/MoShiro.Probe/ProbeConfig.cs

@@ -29,6 +29,10 @@ public sealed class ProbeFleetSection
     /// <summary><c>fleet-enroll</c> 写出的身份目录：<c>node.json</c>、<c>node.key</c>（连面板的密钥）、<c>tls.pfx</c>（对等面的密钥）。</summary>
     [JsonPropertyName("identity_dir")]
     public string IdentityDir { get; set; } = "/etc/moshiro/probe-id";
+
+    /// <summary>节点自己要求有属主（passkey）：没有就不运行。见 <c>OwnerGuard</c>（Agent 和 Probe 共用）。</summary>
+    [JsonPropertyName("require_owner")]
+    public bool RequireOwner { get; set; } = true;
 }
 
 public sealed class KnownAgent