Add prototype gameplay loop with character/battlefield assets and server game APIs.

Co-authored-by: Cursor <cursoragent@cursor.com>

AIClient/Assets/HotUpdate/Scripts/Net/GameNet.cs

@@ -24,11 +24,22 @@ namespace HotUpdate.Net
         public event Action<string> OnWsDisconnected;
         public event Action<int> OnReconnecting;
         public event Action<string> OnMaintenance;
+        public event Action<string> OnLoginFailed;
 
         BootContext _boot;
         bool _started;
         bool _maintenance;
         bool _everConnected;
+        bool _authenticating;
+
+        /// <summary>Renew the same guest identity after an authenticated game API returns 401.</summary>
+        public void RenewSession()
+        {
+            if (_maintenance || _authenticating) return;
+            Socket?.Dispose(); Socket = null; Session = null;
+            _started = false;
+            StartGuestSession();
+        }
 
         public void Bind(BootContext boot)
         {
@@ -61,7 +72,8 @@ namespace HotUpdate.Net
         /// <summary>UI「立即重连」：重置退避并马上再连。</summary>
         public void RequestReconnect()
         {
-            if (_maintenance || Session == null || !Session.IsValid) return;
+            if (_maintenance) return;
+            if (Session == null || !Session.IsValid) { StartGuestSession(); return; }
             SetStatus("手动重连…");
             if (Socket != null)
             {
@@ -87,6 +99,7 @@ namespace HotUpdate.Net
 
         IEnumerator RunGuestFlow()
         {
+            _authenticating = true;
             SetStatus("auth…");
             var deviceId = DeviceId.GetOrCreate();
             var username = $"guest_{deviceId}";
@@ -95,11 +108,14 @@ namespace HotUpdate.Net
             AuthResponse auth = null;
             string err = null;
             yield return AuthApi.EnsureAccount(HttpBase, username, password, (r, e) => { auth = r; err = e; });
+            _authenticating = false;
 
             if (auth == null || string.IsNullOrEmpty(auth.token))
             {
-                SetStatus($"auth fail: {err}");
+                _started = false;
+                SetStatus("登录服务连接失败，请重试");
                 Debug.LogError($"[GameNet] auth failed: {err}");
+                OnLoginFailed?.Invoke(err);
                 yield break;
             }