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

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

apps/api/database/migrations/20270101000092-add-tier-plans-status.js

@@ -0,0 +1,21 @@
+'use strict';
+
+module.exports = {
+  async up(queryInterface, Sequelize) {
+    await queryInterface.addColumn('tier_plans', 'status', {
+      type: Sequelize.ENUM('draft', 'published'),
+      allowNull: false,
+      defaultValue: 'draft',
+    });
+
+    // Preserve current live behavior — every plan that already exists is
+    // visible on the client today (only is_active governs purchasability),
+    // so backfill all of them to 'published'. The 'draft' default only
+    // takes effect for plans created after this migration.
+    await queryInterface.sequelize.query(`UPDATE "tier_plans" SET "status" = 'published'`);
+  },
+
+  async down(queryInterface) {
+    await queryInterface.removeColumn('tier_plans', 'status');
+  },
+};