chore: relocate backend into apps/api ahead of monorepo merge

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

apps/api/database/migrations/20270101000086-remove-message-from-notification-broadcasts.js

@@ -0,0 +1,18 @@
+'use strict';
+
+// Alerts are title-only now — the composer no longer collects a body message
+// (see AddNotificationBroadcast.jsx). Only this table's column goes; the
+// per-recipient admin_notifications/user_notifications.message columns stay
+// (shared by ~20 unrelated notification types via NOTIFICATION_REGISTRY).
+module.exports = {
+  async up(queryInterface) {
+    await queryInterface.removeColumn('notification_broadcasts', 'message');
+  },
+
+  async down(queryInterface, Sequelize) {
+    await queryInterface.addColumn('notification_broadcasts', 'message', {
+      type: Sequelize.TEXT,
+      allowNull: true,
+    });
+  },
+};