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/extend-config-missing.js

@@ -0,0 +1,13 @@
+"use strict";
+
+module.exports = function(it) {
+    const { configName, importerName } = it;
+
+    return `
+ESLint couldn't find the config "${configName}" to extend from. Please check that the name of the config is correct.
+
+The config "${configName}" was referenced from the config file in "${importerName}".
+
+If you still have problems, please stop by https://eslint.org/chat/help to chat with the team.
+`.trimStart();
+};