dev-api: add developer portal, OpenAPI spec, and Flatenbadet case study

- New /developers/ page with API docs, SDKs, pricing, use cases
- OpenAPI 3.0 spec for Orders, Missions, Photos, Analytics
- Case study: Glasskiosken i Flatenbadet — complete ROI analysis
- Updated /order/ with recurring missions and frequency dropdown

services/frilans-payout/node_modules/es-object-atoms/isObject.js

@@ -0,0 +1,6 @@
+'use strict';
+
+/** @type {import('./isObject')} */
+module.exports = function isObject(x) {
+	return !!x && (typeof x === 'function' || typeof x === 'object');
+};