refactor form structure per new spec + fix

- split jury into interne/externe/ULB,
- remove president from student form,
- add language_autre,
- split duration into pages+minutes+annexes,
- move licence to degrés d'ouverture with CC2r,
- add license_custom,
- filter PACS from student AP list,
- editable généralités help block,
- Libre toggle per settings

Fix:
- missing comma after cc4r column in schema.sql
- remove duplicate form footer from partage template
- remove couverture from student files fieldset; add promoteur ULB conditional disable via JS on Approfondi
- promoteur ULB: remove 'si applicable', make required when visible

app/templates/partials/form/checkbox-list.php

@@ -19,7 +19,7 @@ $checked  = $checked  ?? [];
 $required = $required ?? false;
 ?>
 <div>
-    <span class="admin-row-label"><?= htmlspecialchars($label) ?></span>
+    <span class="admin-row-label"><?= htmlspecialchars($label) ?><?= $required ? ' <span class="asterisk">*</span>' : '' ?></span>
     <fieldset class="admin-checkbox-group"<?= $required ? ' required aria-required="true"' : '' ?>>
         <legend class="sr-only"><?= htmlspecialchars($label) ?></legend>
         <ul>