fix: 修复英文首页未关闭的 shortcode 标签

多处 {{% /blocks/feature %} 缺少结束的 }，
导致 Hugo 0.145.0 构建报错 unclosed shortcode。

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: kevinten10

content/en/_index.html

@@ -44,7 +44,7 @@ <h2 style="margin-bottom: 1rem;">Why Capa?</h2>
 
 {{% blocks/feature icon="fa-code" title="Standard APIs" %}}
 Unified standard API layer supporting RPC, Configuration, Pub/Sub, State Management and more distributed capabilities.
-{{% /blocks/feature %}
+{{% /blocks/feature %}}
 
 {{< /blocks/section >}}
 
@@ -156,14 +156,14 @@ <h3 class="text-white mb-3">Rich Feature Set</h3>
 {{< blocks/section color="white" >}}
 {{% blocks/feature icon="fab fa-github" title="Open Source" url="https://github.com/capa-cloud/capa-java" %}}
 Welcome to contribute to Capa by submitting Issues or Pull Requests.
-{{% /blocks/feature %}
+{{% /blocks/feature %}}
 
 {{% blocks/feature icon="fa-comments" title="Discussion" url="/community/" %}}
 Join community discussions about Mecha architecture and cloud-native technologies.
-{{% /blocks/feature %}
+{{% /blocks/feature %}}
 
-{{% blocks/feature icon="fa-envelope" title="Contact" url="https://github.com/capa-cloud/capa-java/issues" %}
+{{% blocks/feature icon="fa-envelope" title="Contact" url="https://github.com/capa-cloud/capa-java/issues" %}}
 Have questions or suggestions? Contact us on GitHub anytime.
-{{% /blocks/feature %}
+{{% /blocks/feature %}}
 {{< /blocks/section >}}
 </function_results>