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/pino/lib/time.js

@@ -0,0 +1,11 @@
+'use strict'
+
+const nullTime = () => ''
+
+const epochTime = () => `,"time":${Date.now()}`
+
+const unixTime = () => `,"time":${Math.round(Date.now() / 1000.0)}`
+
+const isoTime = () => `,"time":"${new Date(Date.now()).toISOString()}"` // using Date.now() for testability
+
+module.exports = { nullTime, epochTime, unixTime, isoTime }