Browsers strip/ignore <script> tags injected via innerHTML. Moved all vanilla
form init logic (MC version loading, node stats, port assignment, helper
functions) from _vanilla_form.ejs into index.ejs loadVanillaForm() callback
where it runs in a proper script context.
_vanilla_form.ejs <script> block replaced with a comment explaining why.
index.ejs now defines vfShowNode, vfRefreshPort, vfUpdateJava as global
functions callable from the form's onchange handlers.
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