Improve server startup logging and update script fetching

Adds success and error logging to the Next.js app preparation process in server.js, including guidance for missing production builds. In versionRouter, always fetches the latest update.sh from GitHub before running updates, logging the outcome and falling back to the local script if fetching fails.

.github/pull_request_template.md

@@ -4,7 +4,7 @@
 
 
 ## 🔗 Related PR / Issue  
-Fixes: #
+Link: #
 
 
 ## ✅ Prerequisites  (**X** in brackets) 

VERSION

@@ -1 +1 @@
-0.5.5
+0.5.4