fix: use Admin namespace for LLM provider/model form onsubmit handlers

The llm-provider-form and llm-model-form in admin.html called
saveLLMProvider(event) and saveLLMModel(event) directly in their
onsubmit attributes. These functions are not in the global scope —
they are only registered on the window.Admin object in admin.js.

This caused the browser to fail silently: event.preventDefault()
was never called, the form fell back to native HTML submission
(page reload), and no provider or model was ever saved.

Fix: prefix both handlers with Admin. so they resolve correctly.

Fixes #4662

Signed-off-by: SealKrach <[email protected]>

Author: SealKrach

mcpgateway/templates/admin.html

@@ -2078,7 +2078,7 @@ <h3 class="text-xl font-semibold text-gray-900 dark:text-white mb-2">
             <div class="fixed inset-0 bg-gray-500 bg-opacity-75 transition-opacity" aria-hidden="true" onclick="Admin.closeLLMProviderModal()"></div>
             <span class="hidden sm:inline-block sm:align-middle sm:h-screen" aria-hidden="true">&#8203;</span>
             <div class="relative z-20 inline-block align-bottom bg-white dark:bg-gray-800 rounded-lg text-left overflow-hidden shadow-xl transform transition-all sm:my-8 sm:align-middle sm:max-w-2xl sm:w-full">
-              <form id="llm-provider-form" onsubmit="saveLLMProvider(event)">
+              <form id="llm-provider-form" onsubmit="Admin.saveLLMProvider(event)">
                 <input type="hidden" id="llm-provider-id" name="provider_id" value="">
                 <div class="bg-white dark:bg-gray-800 px-4 pt-5 pb-4 sm:p-6 sm:pb-4">
                   <h3 class="text-lg leading-6 font-medium text-gray-900 dark:text-white mb-4" id="llm-provider-modal-title">
@@ -2176,7 +2176,7 @@ <h4 class="text-sm font-medium text-gray-900 dark:text-white mb-3">Provider-Spec
             <div class="fixed inset-0 bg-gray-500 bg-opacity-75 transition-opacity" aria-hidden="true" onclick="Admin.closeLLMModelModal()"></div>
             <span class="hidden sm:inline-block sm:align-middle sm:h-screen" aria-hidden="true">&#8203;</span>
             <div class="relative z-20 inline-block align-bottom bg-white dark:bg-gray-800 rounded-lg text-left overflow-visible shadow-xl transform transition-all sm:my-8 sm:align-middle sm:max-w-2xl sm:w-full">
-              <form id="llm-model-form" onsubmit="saveLLMModel(event)">
+              <form id="llm-model-form" onsubmit="Admin.saveLLMModel(event)">
                 <input type="hidden" id="llm-model-id" name="model_id" value="">
                 <div class="bg-white dark:bg-gray-800 px-4 pt-5 pb-4 sm:p-6 sm:pb-4">
                   <h3 class="text-lg leading-6 font-medium text-gray-900 dark:text-white mb-4" id="llm-model-modal-title">