fix(entrypoint): 🖨️ ensure UTF-8 console output

Set console output encoding to UTF-8 for proper Unicode
character display (e.g., emojis) in logs. Removed an unused
using directive and improved code indentation for readability.

Author: caunt

src/EntryPoint.cs

@@ -3,10 +3,12 @@
 using EcoFlow.Mqtt.Api.Extensions;
 using EcoFlow.Mqtt.Api.Services;
 using Microsoft.AspNetCore.Builder;
-using Microsoft.AspNetCore.Hosting;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Logging;
 using Microsoft.Extensions.Options;
+using System.Text;
+
+Console.OutputEncoding = Encoding.UTF8;
 
 var builder = WebApplication.CreateBuilder(args);
 
@@ -29,7 +31,7 @@
 var authentication = authentications.FirstOrDefault(authentication => authentication is AppAuthentication) ?? authentications.First();
 
 if (authentications.Length > 1)
-	Console.WriteLine($"⚠️ Multiple authentication methods configured. Using the {authentication.GetType().Name}.");
+    Console.WriteLine($"⚠️ Multiple authentication methods configured. Using the {authentication.GetType().Name}.");
 
 var httpApi = app.Services.GetRequiredService<InternalHttpApi>();
 var mqttApi = app.Services.GetRequiredService<InternalMqttApi>();
@@ -44,7 +46,7 @@
 Console.WriteLine($"🔌 Subscribing devices to MQTT ({mqttConfiguration.Url}:{mqttConfiguration.Port})...");
 
 foreach (var device in devices)
-	await mqttApi.SubscribeDeviceAsync(session, mqttConfiguration, device);
+    await mqttApi.SubscribeDeviceAsync(session, mqttConfiguration, device);
 
 app.MapGet("/", () => mqttApi.Devices);
 app.Run();