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

MEMORY.md

@@ -40,6 +40,16 @@ Produktfil: `docs/products/quixzoom-auth-core.md`
 Repo: `bernt/quixzoom-auth-core` (Gitea)
 SDK: `@quixzoom/auth-core`
 
+**quiXzoom Frilans Payout (NY 2026-07-14):**
+Utbetalningsprodukt utan företag för flera marknader. Hanterar skatter och avgifter.
+- 8 marknader: SE, NO, DK, FI, DE, NL, US, GB
+- Automatisk källskatt per land
+- Veckovis/månadsvis utbetalning
+- 15% plattform + 6% processing
+
+Produktfil: `quixzoom-auth-core/docs/FRILANS_PAYOUT.md`
+Repo: `bernt/quixzoom-auth-core` (Gitea)
+
 **Developer platform-API:er:**
 `/detect` `/verify` `/compare` `/segment` `/classify` `/authenticate` `/score` `/explain` `/extract` `/track`