feat: jury composition + banner image upload

- migration 004: thesis_supervisors.role + is_external; view adds jury_president/jury_promoteurs/jury_lecteurs
- migration 005: theses.banner_path; view exposes t.banner_path and t.license_id
- Database: getThesisJury(), setThesisJury(), setBannerPath()
- admin/add.php: jury fieldset (président/promoteur/lecteurs + externe checkboxes, JS add/remove rows); banner file input
- admin/edit.php: jury fieldset pre-populated from DB; banner preview + remove checkbox + upload; multipart form
- admin/actions/formulaire.php: parse jury fields → setThesisJury(); banner upload to banners/
- tfe.php: three conditional jury rows (président·e, promoteur·ice, lecteur·ices)
- schema.sql: updated thesis_supervisors, theses, v_theses_full, v_theses_public definitions
- admin.css: fieldset, jury-row, jury-entry, btn-remove styles

public/tfe.php

@@ -107,10 +107,24 @@ $currentNav = '';
                     </div>
                     <?php endif; ?>
 
-                    <?php if (!empty($data['supervisors'])): ?>
+                    <?php if (!empty($data['jury_president'])): ?>
                     <div class="tfe-meta-item">
-                        <span class="label">Promoteur·ice interne :</span>
-                        <span class="value"><?= htmlspecialchars($data['supervisors']) ?></span>
+                        <span class="label">Président·e du jury :</span>
+                        <span class="value"><?= htmlspecialchars($data['jury_president']) ?></span>
+                    </div>
+                    <?php endif; ?>
+
+                    <?php if (!empty($data['jury_promoteurs'])): ?>
+                    <div class="tfe-meta-item">
+                        <span class="label">Promoteur·ice :</span>
+                        <span class="value"><?= htmlspecialchars($data['jury_promoteurs']) ?></span>
+                    </div>
+                    <?php endif; ?>
+
+                    <?php if (!empty($data['jury_lecteurs'])): ?>
+                    <div class="tfe-meta-item">
+                        <span class="label">Lecteur·ices :</span>
+                        <span class="value"><?= htmlspecialchars($data['jury_lecteurs']) ?></span>
                     </div>
                     <?php endif; ?>