feat random bullshit GO!

LctMonolith/Application/Middleware/ErrorHandlingMiddleware.cs

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+using System.Net;
+using System.Text.Json;
+using Serilog;
+
+namespace LctMonolith.Application.Middleware;
+
+/// <summary>
+/// Global error handling middleware capturing unhandled exceptions and converting to standardized JSON response.
+/// </summary>
+public class ErrorHandlingMiddleware
+{
+    private readonly RequestDelegate _next;
+    public ErrorHandlingMiddleware(RequestDelegate next) => _next = next;
+
+    public async Task Invoke(HttpContext ctx)
+    {
+        try
+        {
+            await _next(ctx);
+        }
+        catch (OperationCanceledException)
+        {
+            // Client aborted request (non-standard 499 code used by some proxies)
+            if (!ctx.Response.HasStarted)
+            {
+                ctx.Response.StatusCode = 499; // Client Closed Request (custom)
+            }
+        }
+        catch (Exception ex)
+        {
+            Log.Error(ex, "Unhandled exception");
+            if (ctx.Response.HasStarted) throw;
+
+            ctx.Response.ContentType = "application/json";
+            ctx.Response.StatusCode = (int)HttpStatusCode.InternalServerError;
+            var payload = new { error = new { message = ex.Message, traceId = ctx.TraceIdentifier } };
+            await ctx.Response.WriteAsync(JsonSerializer.Serialize(payload));
+        }
+    }
+}
+
+public static class ErrorHandlingMiddlewareExtensions
+{
+    /// <summary>Adds global error handling middleware.</summary>
+    public static IApplicationBuilder UseErrorHandling(this IApplicationBuilder app) => app.UseMiddleware<ErrorHandlingMiddleware>();
+}

LctMonolith/Application/Options/JwtOptions.cs

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+namespace LctMonolith.Application.Options;
+
+/// <summary>
+/// JWT issuing configuration loaded from appsettings (section Jwt).
+/// </summary>
+public class JwtOptions
+{
+    public string Key { get; set; } = string.Empty;
+    public string Issuer { get; set; } = string.Empty;
+    public string Audience { get; set; } = string.Empty;
+    public int AccessTokenMinutes { get; set; } = 60;
+    public int RefreshTokenDays { get; set; } = 7;
+}
+