Refactor DbContext configuration for flexibility

Updated `ConfigureDbContext` to accept `IServiceProvider`, enabling dependency injection during database context setup. Modified `DependencyInjection.cs` to align with this change by updating `DbContextOptionsAction` and its related method signature.

Removed unused `System.IO` and `System.Text.Json` namespaces from `RecActionController.cs` to improve code cleanliness.

src/ReC.API/Program.cs

@@ -16,7 +16,7 @@ builder.Services.AddRecServices(options =>
 
 builder.Services.AddRecInfrastructure(options =>
 {
-    options.ConfigureDbContext((dbContextOpt) =>
+    options.ConfigureDbContext((provider, dbContextOpt) =>
     {
         var connectionString = builder.Configuration.GetConnectionString("Default") 
                                ?? throw new InvalidOperationException("Connection string is not found.");