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/abort-controller/browser.mjs

@@ -0,0 +1,11 @@
+/*globals self, window */
+
+/*eslint-disable @mysticatea/prettier */
+const { AbortController, AbortSignal } =
+    typeof self !== "undefined" ? self :
+    typeof window !== "undefined" ? window :
+    /* otherwise */ undefined
+/*eslint-enable @mysticatea/prettier */
+
+export default AbortController
+export { AbortController, AbortSignal }