Rename author_email→contact_interne, author_show_contact→contact_public across view/controllers/templates

- v_theses_full: author_email→contact_interne, author_show_contact→contact_public
- Updated schema.sql and live DB view
- Renamed all PHP variables: currentAuthorEmail→contactInterne, currentAuthorShowContact→contactPublic
- Restored contact_interne backoffice field with proper wiring (takes precedence over mail field)
- Updated admin/add.php, admin/edit.php, partage/index.php, public/tfe.php templates

app/templates/public/tfe.php

@@ -226,14 +226,14 @@
                 <?php endif; ?>
 
                 <?php if (
-                    !empty($data["author_email"]) &&
-                    !empty($data["author_show_contact"])
+                    !empty($data["contact_interne"]) &&
+                    !empty($data["contact_public"])
                 ): ?>
                 <div>
                     <dt>Contact :</dt>
                     <dd>
                         <?php
-                        $_contact = $data["author_email"];
+                        $_contact = $data["contact_interne"];
                         $_isUrl =
                             filter_var($_contact, FILTER_VALIDATE_URL) !==
                             false;