feat(api): add create flow endpoint for users

packages/backend/src/controllers/api/v1/users/create-flow.ee.js

@@ -0,0 +1,16 @@
+import { renderObject } from '../../../../helpers/renderer.js';
+import User from '../../../../models/user.js';
+
+export default async (request, response) => {
+  const { templateId } = request.query;
+
+  const user = await User.query()
+    .findById(request.params.userId)
+    .throwIfNotFound();
+
+  const flow = templateId
+    ? await user.createFlowFromTemplate(templateId)
+    : await user.createEmptyFlow();
+
+  renderObject(response, flow, { status: 201 });
+};