chore: completely removed UpdateChecker and startup network check

Author: mishl-dev

common/src/main/kotlin/org/netutils/NetUtilsCommon.kt

@@ -27,9 +27,6 @@ object NetUtilsCommon {
     fun init() {
         LOGGER.info("Initializing NetUtils")
 
-        // Check for updates (GitHub API only - no auto-download)
-        UpdateChecker.checkForUpdates()
-        
         // Register screen input handler for EditBox functionality
         org.netutils.gui.ScreenInputHandler.register()