Improve sitemap, RSS, and SEO guardrails

src/TaxBaik.Web/Pages/Rss.cshtml

@@ -1,17 +1,19 @@
 @page "/rss.xml"
 @model TaxBaik.Web.Pages.RssModel
 @{
+    Layout = null;
     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:content=\"http://purl.org/rss/1.0/modules/content/\">");
+    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("  <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)
@@ -25,11 +27,11 @@
         rssContent.AppendLine($"      <description>{System.Net.WebUtility.HtmlEncode(desc)}</description>");
         if (!string.IsNullOrEmpty(post.Content))
         {
-            rssContent.AppendLine($"      <content:encoded><![CDATA[{post.Content}]]></content:encoded>");
+            rssContent.AppendLine($"      <content:encoded><![CDATA[{post.Content.Replace("]]>", "]]]]><![CDATA[>")}]]></content:encoded>");
         }
         rssContent.AppendLine("    </item>");
     }
 
     rssContent.AppendLine("  </channel>");
     rssContent.AppendLine("</rss>");
-}@rssContent.ToString()
+}@Html.Raw(rssContent.ToString())