Add ExceptionHandlingMiddleware to request pipeline

Refactor `using` directives in `Program.cs` to include `ReC.API.Middleware` for middleware functionality.

Introduce `ExceptionHandlingMiddleware` to the HTTP request pipeline to handle exceptions globally. Suppress CS0618 warnings for its usage. No changes were made to the existing controller service configuration.

src/ReC.API/Program.cs

@@ -1,6 +1,7 @@
 using Microsoft.EntityFrameworkCore;
-using ReC.Infrastructure;
+using ReC.API.Middleware;
 using ReC.Application;
+using ReC.Infrastructure;
 
 var builder = WebApplication.CreateBuilder(args);
 
@@ -30,6 +31,10 @@ builder.Services.AddSwaggerGen();
 
 var app = builder.Build();
 
+#pragma warning disable CS0618
+app.UseMiddleware<ExceptionHandlingMiddleware>();
+#pragma warning restore CS0618
+
 // Configure the HTTP request pipeline.
 if (app.Environment.IsDevelopment())
 {