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/loupe/lib/bigint.js

@@ -0,0 +1,7 @@
+import { truncate, truncator } from './helpers'
+
+export default function inspectBigInt(number, options) {
+  let nums = truncate(number.toString(), options.truncate - 1)
+  if (nums !== truncator) nums += 'n'
+  return options.stylize(nums, 'bigint')
+}