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/eslint/messages/file-not-found.js

@@ -0,0 +1,10 @@
+"use strict";
+
+module.exports = function(it) {
+    const { pattern, globDisabled } = it;
+
+    return `
+No files matching the pattern "${pattern}"${globDisabled ? " (with disabling globs)" : ""} were found.
+Please check for typing mistakes in the pattern.
+`.trimStart();
+};