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/on-exit-leak-free/test/fixtures/close.js

@@ -0,0 +1,21 @@
+'use strict'
+
+const { register } = require('../..')
+const assert = require('assert')
+
+function setup () {
+  const obj = { foo: 'bar' }
+  register(obj, shutdown)
+}
+
+let shutdownCalled = false
+function shutdown (obj) {
+  shutdownCalled = true
+  assert.strictEqual(obj.foo, 'bar')
+}
+
+setup()
+
+process.on('exit', function () {
+  assert.strictEqual(shutdownCalled, true)
+})