[Core] fix one-time login (#719)

Author: DarkRRb

Lagrange.OneBot/Core/Login/LoginService.cs

@@ -1,3 +1,4 @@
+using System.Text.Json;
 using Lagrange.Core;
 using Lagrange.Core.Common.Interface.Api;
 using Lagrange.Core.Event.EventArg;
@@ -57,6 +58,9 @@ public async Task StartAsync(CancellationToken token)
 
         if (!isSucceed) throw new Exception("All login failed!");
 
+        string keystoreJson = JsonSerializer.Serialize(_lagrange.UpdateKeystore());
+        File.WriteAllText(configuration["ConfigPath:Keystore"] ?? "keystore.json", keystoreJson);
+
         _logger.LogInformation("Bot Uin: {}", _lagrange.BotUin);
 
         await _web.StartAsync(token);

Lagrange.OneBot/Extensions/HostApplicationBuilderExtension.cs

@@ -48,9 +48,14 @@ public static HostApplicationBuilder ConfigureLagrangeCore(this HostApplicationB
                 var configuration = services.GetRequiredService<IConfiguration>();
                 string path = configuration["ConfigPath:DeviceInfo"] ?? "device.json";
 
-                return File.Exists(path)
+                var device = File.Exists(path)
                     ? JsonSerializer.Deserialize<BotDeviceInfo>(File.ReadAllText(path)) ?? BotDeviceInfo.GenerateInfo()
                     : BotDeviceInfo.GenerateInfo();
+
+                string deviceJson = JsonSerializer.Serialize(device);
+                File.WriteAllText(path, deviceJson);
+
+                return device;
             })
             .AddSingleton((services) => // Keystore
             {