feat: add MaxSubs, MaxSubTokens, Debug, Trace, LogFile, LogSizeLimit, Tags to NatsOptions

src/NATS.Server/NatsOptions.cs

@@ -16,6 +16,19 @@ public sealed class NatsOptions
     public TimeSpan PingInterval { get; set; } = TimeSpan.FromMinutes(2);
     public int MaxPingsOut { get; set; } = 2;
 
+    // Subscription limits
+    public int MaxSubs { get; set; }             // 0 = unlimited (per-connection)
+    public int MaxSubTokens { get; set; }        // 0 = unlimited
+
+    // Logging / diagnostics
+    public bool Debug { get; set; }
+    public bool Trace { get; set; }
+    public string? LogFile { get; set; }
+    public long LogSizeLimit { get; set; }
+
+    // Server tags (exposed via /varz)
+    public Dictionary<string, string>? Tags { get; set; }
+
     // Simple auth (single user)
     public string? Username { get; set; }
     public string? Password { get; set; }