refactor: implement unified startup validator architecture with IStartupValidator interface

octo-fiesta/Services/Validation/StartupValidationOrchestrator.cs

@@ -0,0 +1,55 @@
+using Microsoft.Extensions.Options;
+using octo_fiesta.Models;
+
+namespace octo_fiesta.Services.Validation;
+
+/// <summary>
+/// Orchestrates startup validation for all configured services.
+/// This replaces the old StartupValidationService with a more extensible architecture.
+/// </summary>
+public class StartupValidationOrchestrator : IHostedService
+{
+    private readonly IEnumerable<IStartupValidator> _validators;
+    private readonly IOptions<SubsonicSettings> _subsonicSettings;
+
+    public StartupValidationOrchestrator(
+        IEnumerable<IStartupValidator> validators,
+        IOptions<SubsonicSettings> subsonicSettings)
+    {
+        _validators = validators;
+        _subsonicSettings = subsonicSettings;
+    }
+
+    public async Task StartAsync(CancellationToken cancellationToken)
+    {
+        Console.WriteLine();
+        Console.WriteLine("========================================");
+        Console.WriteLine("       octo-fiesta starting up...       ");
+        Console.WriteLine("========================================");
+        Console.WriteLine();
+
+        // Run all validators
+        foreach (var validator in _validators)
+        {
+            try
+            {
+                await validator.ValidateAsync(cancellationToken);
+            }
+            catch (Exception ex)
+            {
+                Console.WriteLine($"Error validating {validator.ServiceName}: {ex.Message}");
+            }
+        }
+
+        Console.WriteLine();
+        Console.WriteLine("========================================");
+        Console.WriteLine("       Startup validation complete      ");
+        Console.WriteLine("========================================");
+        Console.WriteLine();
+    }
+
+    public Task StopAsync(CancellationToken cancellationToken)
+    {
+        return Task.CompletedTask;
+    }
+}