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/events/.airtap.yml

@@ -0,0 +1,15 @@
+sauce_connect: true
+loopback: airtap.local
+browsers:
+  - name: chrome
+    version: latest
+  - name: firefox
+    version: latest
+  - name: safari
+    version: 9..latest
+  - name: iphone
+    version: latest
+  - name: ie
+    version: 9..latest
+  - name: microsoftedge
+    version: 13..latest