fix migration 028, promoteurice repopulation, DB bootstrap

- Fix undefined $isExternalUrl in tfe.php (moved after assignment)
- Disable PeerTube rendering in tfe.php entirely
- Migration 028: drop banner_path from theses with proper view handling
  - Drop dependent views before column, recreate without banner_path
  - Remove broken 027_drop_banner_path.sql
  - Move 025_fix_oui_non_artefacts.sql and 021_peertube_settings.sql to applied/
- Add scripts/ensure-db.php to init fresh DB from schema.sql when missing
- Update deploy justfile to run ensure-db.php before migrations
- Fix promoteurice array repopulation in partage form:
  - Fix old() to return raw arrays (not json_encode) so callers can iterate
  - Handle jury_promoteur[] and jury_promoteur_ulb_name[] arrays properly

app/templates/partials/form/jury-fieldset.php

@@ -95,7 +95,7 @@ if ($addMode && function_exists('old')) {
             <?php endif; ?>
         </div>
         <button type="button" class="btn btn--secondary admin-add-jury-btn"
-                onclick="addJuryRow('jury-promoteur-interne-list', 'jury_promoteur', 'Promoteur·ice interne')">
+                onclick="addJuryRow('jury-promoteur-interne-list', 'jury_promoteur[]', 'Promoteur·ice interne')">
             + Ajouter un·e promoteur·ice interne
         </button>
     </fieldset>
@@ -133,7 +133,7 @@ if ($addMode && function_exists('old')) {
             <?php endif; ?>
         </div>
         <button type="button" class="btn btn--secondary admin-add-jury-btn"
-                onclick="addJuryRow('jury-promoteur-ulb-list', 'jury_promoteur_ulb_name', 'Promoteur·ice ULB')">
+                onclick="addJuryRow('jury-promoteur-ulb-list', 'jury_promoteur_ulb_name[]', 'Promoteur·ice ULB')">
             + Ajouter un·e promoteur·ice ULB
         </button>
     </fieldset>