feat: 重构 TodoList 架构，新增动态 API 与 MAUI 内嵌 Web 服务

src/TodoList.Maui/MauiProgram.cs

@@ -1,4 +1,10 @@
+using System.Text.Json;
+using Microsoft.EntityFrameworkCore;
 using Microsoft.Extensions.Logging;
+using Microsoft.Data.Sqlite;
+using TodoList.Application;
+using TodoList.Application.Data;
+using TodoList.Maui.Models;
 using TodoList.Maui.Services;
 using TodoList.Maui.Services.Platforms;
 
@@ -17,21 +23,88 @@ public static class MauiProgram
 				fonts.AddFont("OpenSans-Semibold.ttf", "OpenSansSemibold");
 			});
 
-		builder.Services.AddSingleton<IHotKeySettingsService, HotKeySettingsService>();
-		builder.Services.AddSingleton<IGlobalHotKeyService>(sp => new NullGlobalHotKeyService());
+		var appSettings = LoadAppSettings();
+		
+		// Set default connection string if not provided
+		if (string.IsNullOrEmpty(appSettings.WebServer.ConnectionString))
+		{
+			var dbPath = Path.Combine(FileSystem.AppDataDirectory, "todolist.db");
+			appSettings.WebServer.ConnectionString = $"Data Source={dbPath}";
+		}
+		
+		builder.Services.AddSingleton(appSettings);
+		var connectionString = appSettings.WebServer.ConnectionString;
+
+		builder.Services.AddApplicationServices(connectionString);
+
+		builder.Services.AddSingleton<IHotKeySettingsService>(sp =>
+			new HotKeySettingsService(sp.GetRequiredService<AppSettings>()));
+		builder.Services.AddSingleton<IGlobalHotKeyService>(sp => GlobalHotKeyServiceFactory.Create());
 		builder.Services.AddSingleton<ISystemTrayService>(sp =>
 		{
 #if WINDOWS
-			return new NullSystemTrayService();
+			return new WindowsSystemTrayService();
 #else
 			return new NullSystemTrayService();
 #endif
 		});
+        builder.Services.AddSingleton<IEmbeddedWebServerService, EmbeddedWebServerService>();
 
 #if DEBUG
-		builder.Logging.AddDebug();
+        builder.Logging.AddDebug();
 #endif
 
-		return builder.Build();
+		var app = builder.Build();
+		
+		// Ensure database directory exists and apply migrations
+		using (var scope = app.Services.CreateScope())
+		{
+			try
+			{
+				var dbContext = scope.ServiceProvider.GetRequiredService<TodoDbContext>();
+				
+				// Ensure database directory exists for the actual connection string
+				var sqliteBuilder = new SqliteConnectionStringBuilder(connectionString);
+				var actualDbPath = sqliteBuilder.DataSource;
+				if (!string.IsNullOrEmpty(actualDbPath))
+				{
+					// If it's a relative path, we might need to resolve it, 
+					// but for SQLite, it's usually better to have absolute paths.
+					// For MAUI, FileSystem.AppDataDirectory returns an absolute path.
+					var dbDir = Path.GetDirectoryName(actualDbPath);
+					if (!string.IsNullOrEmpty(dbDir) && !Directory.Exists(dbDir))
+					{
+						Directory.CreateDirectory(dbDir);
+					}
+				}
+				
+				// Ensure database is up to date
+				dbContext.Database.Migrate();
+			}
+			catch (Exception ex)
+			{
+				System.Diagnostics.Debug.WriteLine($"Database initialization failed: {ex.Message}");
+				// Fallback to EnsureCreated if Migrate fails (though Migrate is preferred)
+				using var context = scope.ServiceProvider.GetRequiredService<TodoDbContext>();
+				context.Database.EnsureCreated();
+			}
+		}
+		
+		var webServer = app.Services.GetRequiredService<IEmbeddedWebServerService>();
+		_ = webServer.StartAsync();
+
+		return app;
+	}
+
+	private static AppSettings LoadAppSettings()
+	{
+		var settingsPath = Path.Combine(AppContext.BaseDirectory, "appsettings.json");
+		if (!File.Exists(settingsPath))
+		{
+			return new AppSettings();
+		}
+
+		var json = File.ReadAllText(settingsPath);
+		return JsonSerializer.Deserialize<AppSettings>(json) ?? new AppSettings();
 	}
 }