test(parity): port 373 Go tests across protocol and services subsystems (C11+E15)

Protocol (C11):
- ClientProtocolGoParityTests: 45 tests (header stripping, tracing, limits, NRG)
- ConsumerGoParityTests: 60 tests (filters, actions, pinned, priority groups)
- JetStreamGoParityTests: 38 tests (stream CRUD, purge, mirror, retention)

Services (E15):
- MqttGoParityTests: 65 tests (packet parsing, QoS, retained, sessions)
- WsGoParityTests: 58 tests (compression, JWT auth, frame encoding)
- EventGoParityTests: 56 tests (event DTOs, serialization, health checks)
- AccountGoParityTests: 28 tests (route mapping, system account, limits)
- MonitorGoParityTests: 23 tests (connz filtering, pagination, sort)

DB: 1,148/2,937 mapped (39.1%), up from 1,012 (34.5%)

src/NATS.Server/JetStream/Models/StreamConfig.cs

@@ -3,6 +3,7 @@ namespace NATS.Server.JetStream.Models;
 public sealed class StreamConfig
 {
     public string Name { get; set; } = string.Empty;
+    public string Description { get; set; } = string.Empty;
     public List<string> Subjects { get; set; } = [];
     public int MaxMsgs { get; set; }
     public long MaxBytes { get; set; }