Retructured solution

LiteCharms.Features/Email/Extensions/Constants.cs

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+namespace LiteCharms.Features.Email.Extensions;
+
+public static class Constants
+{
+    public const string ShopSchedulerName = "shop";
+    public const string ShopEmailFromName = "Khongisa Shop";
+    public const string ShopEmailFromAddress = "shop@litecharms.co.za";
+}

LiteCharms.Features/Email/Extensions/EmailTelemetry.cs

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+namespace LiteCharms.Features.Email.Extensions;
+
+public static class EmailTelemetry
+{
+    public static readonly ActivitySource Source = new("LiteCharms.EmailService");
+    public static readonly Meter Meter = new("LiteCharms.EmailService");
+    public static readonly Counter<long> EmailsSent = Meter.CreateCounter<long>("emails_sent_total", "count", "Total successful emails sent");
+    public static readonly Counter<long> EmailsFailed = Meter.CreateCounter<long>("emails_failed_total", "count", "Total failed email attempts");
+}

LiteCharms.Features/Email/Extensions/Setup.cs

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+using LiteCharms.Features.Email.Configuration;
+
+namespace LiteCharms.Features.Email.Extensions;
+
+public static class Setup
+{
+    public static IServiceCollection AddEmailServices(this IServiceCollection services, IConfiguration configuration)
+    {
+        services.Configure<SmtpSettings>(configuration.GetSection("Email"));
+
+        services.AddSingleton<IEmailService, EmailService>();
+
+        services.AddOpenTelemetry()
+            .WithTracing(tracing => tracing.AddSource("LiteCharms.EmailService"))
+            .WithMetrics(metrics => metrics.AddMeter("LiteCharms.EmailService"));
+
+        return services;
+    }
+}