Persistenza dati e logging avanzato con UI e Unraid

- Aggiunto TradeHistoryService per persistenza trade/posizioni attive su disco (JSON, auto-save/restore)
- Logging centralizzato (LoggingService) con livelli, categorie, simbolo e buffer circolare (500 log)
- Nuova pagina Logs: monitoraggio real-time, filtri avanzati, cancellazione log, colorazione livelli
- Sezione "Dati Persistenti" in Settings: conteggio trade, dimensione dati, reset con conferma modale
- Background service per salvataggio sicuro su shutdown/stop container
- Aggiornata sidebar, stili modali/bottoni danger, .gitignore e documentazione (README, CHANGELOG, UNRAID_INSTALL, checklist)
- Versione 1.3.0

TradingBot/Services/TradingBotBackgroundService.cs

@@ -0,0 +1,58 @@
+namespace TradingBot.Services;
+
+/// <summary>
+/// Background service for automatic data persistence on application shutdown
+/// </summary>
+public class TradingBotBackgroundService : BackgroundService
+{
+    private readonly TradingBotService _tradingBotService;
+    private readonly ILogger<TradingBotBackgroundService> _logger;
+    private readonly IHostApplicationLifetime _lifetime;
+
+    public TradingBotBackgroundService(
+        TradingBotService tradingBotService,
+        ILogger<TradingBotBackgroundService> logger,
+        IHostApplicationLifetime lifetime)
+    {
+        _tradingBotService = tradingBotService;
+        _logger = logger;
+        _lifetime = lifetime;
+    }
+
+    protected override async Task ExecuteAsync(CancellationToken stoppingToken)
+    {
+        _logger.LogInformation("TradingBot Background Service started");
+
+        // Register shutdown handler
+        _lifetime.ApplicationStopping.Register(OnShutdown);
+
+        // Keep service running
+        await Task.Delay(Timeout.Infinite, stoppingToken);
+    }
+
+    private void OnShutdown()
+    {
+        _logger.LogInformation("Application shutdown detected, saving trade data...");
+        
+        try
+        {
+            // Stop bot if running
+            if (_tradingBotService.Status.IsRunning)
+            {
+                _tradingBotService.Stop();
+            }
+            
+            _logger.LogInformation("Trade data saved successfully on shutdown");
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Error saving data on shutdown");
+        }
+    }
+
+    public override async Task StopAsync(CancellationToken cancellationToken)
+    {
+        _logger.LogInformation("TradingBot Background Service stopping");
+        await base.StopAsync(cancellationToken);
+    }
+}