Fix: email clearing in findOrCreateAuthor, htmlspecialchars(null) crash in old(), dead contact_interne field, access_type_id radio clearing

- findOrCreateAuthor: always update email column (pass null when empty/falsy) so clearing an email actually persists
- admin/add.php & admin/edit.php old(): add null guard before htmlspecialchars, cast to string
- jury-fieldset.php: guard against old() returning array for scalar-checked jury_lecteur keys
- formulaire.php: only suppress display_errors in production (not cli-server dev mode)
- Removed dead contact_interne field from backoffice form (no DB column, never saved)
- Removed dead contactInterne validation from ThesisCreateController
- Added "— Non défini" radio option for access_type_id in admin mode for clearing
- Fixed strict int-vs-string comparison breaking radio button checked detection

app/templates/partials/form/form.php

@@ -511,20 +511,7 @@ $checkedFormatsForSiteWeb = $checkedFormatsForSiteWeb ?? [];
                 <small>Case logistique : cocher si un exemplaire physique est disponible à l'ERG.</small>
             </div>
 
-            <!-- 7. Contact interne -->
-            <div class="admin-form-group">
-                <label for="contact_interne">Contact interne :</label>
-                <input type="email" id="contact_interne" name="contact_interne"
-                       value="<?= htmlspecialchars(
-                           $currentRaw["contact_interne"] ??
-                               ($formData["contact_interne"] ??
-                                   ($currentAuthorEmail ?? "")),
-                       ) ?>"
-                       placeholder="ton.email@exemple.be">
-                <small>Adresse de contact interne (non visible publiquement).</small>
-            </div>
-
-            <!-- 8. Publication -->
+            <!-- 7. Publication -->
             <div class="admin-form-group">
                 <label class="admin-checkbox-label">
                     <input type="checkbox" name="is_published" value="1"