fix: use 'tools' parent for v13 compatibility

The 'admin' module group was introduced in TYPO3 v14. On v13, only
'tools' exists as the admin tools parent module. Using 'admin' causes
the LLM modules to silently fail to register on v13.

Change to 'tools' which works on both versions:
- v13: 'tools' exists natively
- v14: 'tools' is an alias for 'admin'

Signed-off-by: Sebastian Mendel <info@sebastianmendel.de>

Author: CybotTM

Configuration/Backend/Modules.php

@@ -17,9 +17,13 @@
 /**
  * Backend module registration for nr_llm.
  *
- * Structure: Main module under 'admin', sub-modules as children of main module.
+ * Structure: Main module under 'tools', sub-modules as children of main module.
  * Sub-modules only appear in docheader dropdown, not in main navigation.
  *
+ * Uses 'tools' as parent for v13+v14 compatibility:
+ * - v13: 'tools' exists natively as the admin tools group
+ * - v14: 'tools' is an alias for the new 'admin' group
+ *
  * Pattern follows TYPO3 Styleguide extension:
  * - Main module identifier without prefix (e.g., 'nrllm' not 'tools_nrllm')
  * - Child modules with parent as prefix (e.g., 'nrllm_providers')
@@ -28,7 +32,7 @@
 return [
     // Main dashboard module (parent container)
     'nrllm' => [
-        'parent' => 'admin',
+        'parent' => 'tools',
         'position' => ['after' => 'styleguide'],
         'access' => 'admin',
         'iconIdentifier' => 'module-nrllm',