Add configurable snippet support and extend user comment info

src/main/resources/application.properties

@@ -20,6 +20,8 @@ app.upload.max-size=${UPLOAD_MAX_SIZE:5242880}
 # Default list size for user posts and replies
 app.user.posts-limit=${USER_POSTS_LIMIT:10}
 app.user.replies-limit=${USER_REPLIES_LIMIT:50}
+# Length of extracted snippets for posts and search (-1 to disable truncation)
+app.snippet-length=${SNIPPET_LENGTH:50}
 
 # Captcha configuration
 app.captcha.enabled=${CAPTCHA_ENABLED:false}