feat: 删除 WebView2 环境

App.xaml.cs

@@ -95,18 +95,6 @@ private void Cleanup(CleanupLevel level = CleanupLevel.Normal)
             {
                 _logger.Debug($"开始清理服务... 清理级别: {level}");
 
-                // 清理 WebView2 环境
-                try
-                {
-                    var webView2Service = Services.WebView2Service.Instance;
-                    webView2Service.Dispose();
-                    _logger.Debug("WebView2 服务已清理");
-                }
-                catch (Exception ex)
-                {
-                    _logger.Error("清理 WebView2 服务失败", ex);
-                }
-
                 // 确保所有服务都被释放
                 if (LyKeysDriver != null)
                 {

Services/Cache/MarkdownCacheService.cs

@@ -0,0 +1,73 @@
+using System;
+using System.Collections.Generic;
+using System.Windows.Documents;
+using Markdig;
+using Markdig.Syntax;
+
+namespace WpfApp.Services.Cache
+{
+    public class MarkdownCacheService
+    {
+        private static readonly Lazy<MarkdownCacheService> _instance = 
+            new Lazy<MarkdownCacheService>(() => new MarkdownCacheService());
+
+        public static MarkdownCacheService Instance => _instance.Value;
+
+        private string _cachedMarkdown;
+        private MarkdownDocument _cachedDocument;
+        private readonly MarkdownPipeline _pipeline;
+        private readonly object _lock = new object();
+        private readonly SerilogManager _logger = SerilogManager.Instance;
+
+        private MarkdownCacheService()
+        {
+            _pipeline = new MarkdownPipelineBuilder()
+                .UseAdvancedExtensions()
+                .Build();
+        }
+
+        public void SetMarkdownContent(string markdown)
+        {
+            lock (_lock)
+            {
+                try
+                {
+                    _cachedMarkdown = markdown;
+                    _cachedDocument = Markdown.Parse(markdown, _pipeline);
+                    _logger.Debug("Markdown内容已缓存");
+                }
+                catch (Exception ex)
+                {
+                    _logger.Error("缓存Markdown内容失败", ex);
+                    throw;
+                }
+            }
+        }
+
+        public (string RawMarkdown, MarkdownDocument ParsedDocument) GetMarkdownContent()
+        {
+            lock (_lock)
+            {
+                return (_cachedMarkdown, _cachedDocument);
+            }
+        }
+
+        public bool HasContent()
+        {
+            lock (_lock)
+            {
+                return !string.IsNullOrEmpty(_cachedMarkdown) && _cachedDocument != null;
+            }
+        }
+
+        public void ClearCache()
+        {
+            lock (_lock)
+            {
+                _cachedMarkdown = null;
+                _cachedDocument = null;
+                _logger.Debug("Markdown缓存已清除");
+            }
+        }
+    }
+}