Refactor: Migliorata gestione percorsi database multi-piattaforma e pulizia file temporanei

- Implementato supporto per percorsi database specifici per OS (Windows, Linux, macOS)
- Rimossi file temporanei e di test non necessari dal CredentialManager
- Aggiunto supporto per directory di sistema standard per il database delle credenziali
- Mantenuto il codice legacy commentato per retrocompatibilità
- Aggiunte cartelle di test per future implementazioni

Data_Coupler/Program.cs

@@ -23,11 +23,39 @@ builder.Services.AddServerSideBlazor();
 builder.Services.AddWindowsService();
 builder.Services.AddHostedService<BackgroundServices>();
 
-// Add CredentialManager services
-var contentRoot = builder.Environment.ContentRootPath;
-var dataPath = Path.Combine(contentRoot, "wwwroot", "data");
-Directory.CreateDirectory(dataPath); // Assicurati che la directory esista
-var dbPath = Path.Combine(dataPath, "credentials.db");
+#region Database Directory Path management
+
+string dbPath = string.Empty;
+
+if (OperatingSystem.IsWindows())
+{
+    dbPath = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.CommonApplicationData), "Data_Coupler", "credentials.db");
+}
+else if (OperatingSystem.IsLinux())
+{
+    dbPath = "/var/lib/Data_Coupler/credentials.db";
+}
+else if (OperatingSystem.IsMacOS())
+{
+    dbPath = "/Library/Application Support/Data_Coupler/credentials.db";
+}
+
+var dbDirectory = Path.GetDirectoryName(dbPath);
+if (!Directory.Exists(dbDirectory))
+{
+    Directory.CreateDirectory(dbDirectory!);
+}
+
+#endregion
+
+#region OLD DB PATH
+// // Add CredentialManager services
+// var contentRoot = builder.Environment.ContentRootPath;
+// var dataPath = Path.Combine(contentRoot, "wwwroot", "data");
+// Directory.CreateDirectory(dataPath); // Assicurati che la directory esista
+// var dbPath = Path.Combine(dataPath, "credentials.db");
+#endregion
+
 builder.Services.AddDataConnectionCredentialManagement($"Data Source={dbPath}");
 
 // Register IHttpClientFactory