fix: unify CSV import/export columns, fix import JS error, fix createThesis VALUES

- Fix createThesis SQL: extra ? placeholder in VALUES (27 values for 26 columns)
- Add createThesis integration tests to catch column/value mismatches
- Add CSV_COLUMNS as single source of truth in ExportController, deriving
  csvHeaders() and positional fallback from it
- Add missing columns to export query + CSV: duration_pages, duration_minutes,
  has_annexes, license_custom, contact_visible, objet
- Add missing columns to import INSERT: license_id, license_custom, cc2r,
  exemplaire_baiu, exemplaire_erg, objet, contact_visible, duration_pages,
  duration_minutes, has_annexes
- Resolve license name → license_id during import
- Fix XamxamInitFilePonds: add file-upload-filepond.js to admin-entry.js
  so FilePond initialization code is available on the admin list page
- Add FilePond vendor CSS to admin.min.css bundle (import dialog styling)
- Generate .admin-file-hint from csvHeaders() instead of hardcoded stale list
- Use positional fallback from CSV_COLUMNS for import cell parsing

app/templates/admin/partials/dialogs/import.php

@@ -1,3 +1,9 @@
+<?php
+// Ensure ExportController is available for the CSV column hint
+if (!class_exists('ExportController')) {
+    require_once APP_ROOT . '/src/Controllers/ExportController.php';
+}
+?>
 <dialog id="import-dialog" class="admin-dialog" aria-labelledby="import-dialog-title">
     <div class="admin-dialog__header">
         <h3 id="import-dialog-title">Importer une liste de TFE</h3>
@@ -51,7 +57,7 @@
                        data-queue-type="csv_import"
                        required>
                 <small class="admin-file-hint">
-                    Colonnes : Identifiant, Titre, Sous-titre, Auteur·ice(s), Contact, Promoteur·ice(s), Format, Année, AP, Orientation, Finalité, Mots-clés, Synopsis, Contexte, Remarques, Langue, Autorisation, License, taille, Points sur 20, lien BAIU<br>
+                    Colonnes : <?= htmlspecialchars(implode(', ', ExportController::csvHeaders())) ?><br>
                     Quatre premières lignes ignorées — Séparateur : virgule — UTF-8
                 </small>
             </div>