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/public/admin/add.php

@@ -23,6 +23,12 @@ $formData      = $_SESSION['form_data'] ?? [];
 unset($_SESSION['form_data']);
 $autofocusField = App::consumeAutofocus();
 
+// Site settings for licence / access type toggles
+$siteSettings = Database::getInstance()->getAllSettings();
+// Form help blocks
+$helpBlocks = Database::getInstance()->getAllFormHelpBlocks();
+$helpFn = fn(string $key) => $helpBlocks[$key]['content'] ?? '';
+
 function withAutofocus(string $fieldName, array $attrs = []): array {
     global $autofocusField;
     if ($autofocusField === $fieldName) {