Disable auto-trigger on update-server.yml — manual only

Workflow was corrupting updates.xml with empty template values.
Manual dispatch only until MokoStandards fixes manifest parsing.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.github/workflows/update-server.yml

@@ -20,13 +20,6 @@
 name: Update Joomla Update Server XML Feed
 
 on:
-  push:
-    branches:
-      - main
-      - version/*
-    paths:
-      - 'src/**'
-      - 'htdocs/**'
   workflow_dispatch:
     inputs:
       stability: