v1.2.0: 重构为插件+独立Manager架构，横版UI，精确保留文本框边距的文档转换

Better-EN5/InkAutoSaveService.cs

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+using System;
+using System.IO;
+using System.Text.Json;
+using System.Threading.Tasks;
+using BetterEN5.Services;
+
+namespace BetterEN5
+{
+    public class InkAutoSaveService
+    {
+        private static readonly string SettingsPath = Path.Combine(
+            Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData),
+            "BetterEN5", "ink-settings.json");
+
+        public async Task StartAsync()
+        {
+            while (true)
+            {
+                try
+                {
+                    var settings = LoadSettings();
+                    if (settings != null && settings.AutoSaveEnabled)
+                    {
+                        var dir = settings.SaveDirectory;
+                        if (!string.IsNullOrEmpty(dir))
+                        {
+                            if (!Directory.Exists(dir))
+                                Directory.CreateDirectory(dir);
+                            var timestamp = DateTime.Now.ToString("yyyyMMdd-HHmmss");
+                            var filePath = Path.Combine(dir, $"ink-auto-{timestamp}.ink.json");
+                            var inkService = new InkService();
+                            await inkService.ExportInkAsync(filePath);
+
+                            var retentionMinutes = settings.AutoSaveIntervalMinutes * 2;
+                            CleanOldFiles(dir, TimeSpan.FromMinutes(retentionMinutes > 0 ? retentionMinutes : 10));
+                        }
+                    }
+                }
+                catch { }
+
+                var intervalMinutes = LoadSettings()?.AutoSaveIntervalMinutes ?? 5;
+                await Task.Delay(TimeSpan.FromMinutes(Math.Max(1, intervalMinutes)));
+            }
+        }
+
+        private static InkAutoSaveSettings? LoadSettings()
+        {
+            try
+            {
+                if (File.Exists(SettingsPath))
+                {
+                    var json = File.ReadAllText(SettingsPath);
+                    return JsonSerializer.Deserialize<InkAutoSaveSettings>(json);
+                }
+            }
+            catch { }
+            return null;
+        }
+
+        private static void CleanOldFiles(string dir, TimeSpan maxAge)
+        {
+            try
+            {
+                if (!Directory.Exists(dir)) return;
+                foreach (var file in Directory.GetFiles(dir, "ink-auto-*.ink.json"))
+                {
+                    try
+                    {
+                        if (DateTime.Now - File.GetCreationTime(file) > maxAge)
+                            File.Delete(file);
+                    }
+                    catch { }
+                }
+            }
+            catch { }
+        }
+    }
+
+    public class InkAutoSaveSettings
+    {
+        public bool AutoSaveEnabled { get; set; }
+        public int AutoSaveIntervalMinutes { get; set; } = 5;
+        public string SaveDirectory { get; set; } = "";
+    }
+}