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/select-field.php

@@ -23,7 +23,7 @@ $hint        = $hint        ?? null;
 $attrs       = $attrs       ?? [];
 ?>
 <div>
-    <label for="<?= htmlspecialchars($id) ?>"><?= htmlspecialchars($label) ?></label>
+    <label for="<?= htmlspecialchars($id) ?>"><?= htmlspecialchars($label) ?><?= $required ? ' <span class="asterisk">*</span>' : '' ?></label>
 <?php
 $selectAttrStr = '';
 foreach ($attrs as $k => $v) {