fix: add structural guard for migration 008 in migrate.sh

scripts/migrate.sh

@@ -52,6 +52,12 @@ already_applied_structurally() {
             count=$(sqlite3 "$db" "SELECT COUNT(*) FROM sqlite_master WHERE type='index' AND name='idx_theses_pub_year';")
             [ "$count" -eq 1 ]
             ;;
+        008_formulaire_settings.sql)
+            # Effect: site_settings table exists + show_contact column on authors
+            tbl=$(sqlite3 "$db" "SELECT COUNT(*) FROM sqlite_master WHERE type='table' AND name='site_settings';")
+            col=$(sqlite3 "$db" "SELECT COUNT(*) FROM pragma_table_info('authors') WHERE name='show_contact';")
+            [ "$tbl" -eq 1 ] && [ "$col" -eq 1 ]
+            ;;
         *)
             # Unknown migration — assume not applied
             return 1