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/uri-js/dist/esnext/util.d.ts

@@ -0,0 +1,6 @@
+export declare function merge(...sets: Array<string>): string;
+export declare function subexp(str: string): string;
+export declare function typeOf(o: any): string;
+export declare function toUpperCase(str: string): string;
+export declare function toArray(obj: any): Array<any>;
+export declare function assign(target: object, source: any): any;