Simplify RSS for Naver compatibility

src/TaxBaik.Web/Pages/Rss.cshtml

@@ -5,22 +5,20 @@
     Response.ContentType = "application/rss+xml; charset=utf-8";
     var rssContent = new System.Text.StringBuilder();
     rssContent.AppendLine("<?xml version=\"1.0\" encoding=\"utf-8\"?>");
-    rssContent.AppendLine("<rss version=\"2.0\" xmlns:atom=\"http://www.w3.org/2005/Atom\" xmlns:content=\"http://purl.org/rss/1.0/modules/content/\">");
+    rssContent.AppendLine("<rss version=\"2.0\">");
     rssContent.AppendLine("  <channel>");
     rssContent.AppendLine("    <title>백원숙 세무회계 - 블로그</title>");
     rssContent.AppendLine("    <link>https://www.taxbaik.com</link>");
     rssContent.AppendLine("    <description>세무사 백원숙의 세금, 부동산, 가족자산 전문 블로그</description>");
     rssContent.AppendLine("    <language>ko-KR</language>");
     rssContent.AppendLine($"    <lastBuildDate>{Model.LastBuildDate}</lastBuildDate>");
-    rssContent.AppendLine("    <atom:link href=\"https://www.taxbaik.com/rss.xml\" rel=\"self\" type=\"application/rss+xml\" />");
     rssContent.AppendLine("    <ttl>60</ttl>");
 
     foreach (var post in Model.Posts)
     {
         var postUrl = $"https://www.taxbaik.com/blog/{Uri.EscapeDataString(post.Slug)}";
-        var description = post.Content?.Substring(0, Math.Min(200, post.Content?.Length ?? 0)) ?? string.Empty;
-        var safeDescription = description.Replace("]]>", "]]]]><![CDATA[>");
-        var safeContent = post.Content?.Replace("]]>", "]]]]><![CDATA[>");
+        var fullDescription = post.Content ?? string.Empty;
+        var safeDescription = fullDescription.Replace("]]>", "]]]]><![CDATA[>");
 
         rssContent.AppendLine("    <item>");
         rssContent.AppendLine($"      <title>{System.Net.WebUtility.HtmlEncode(post.Title)}</title>");
@@ -33,12 +31,6 @@
         }
 
         rssContent.AppendLine($"      <description><![CDATA[{safeDescription}]]></description>");
-
-        if (!string.IsNullOrWhiteSpace(safeContent))
-        {
-            rssContent.AppendLine($"      <content:encoded><![CDATA[{safeContent}]]></content:encoded>");
-        }
-
         rssContent.AppendLine("    </item>");
     }