[Bounty] 🏭 Bounty: API Documentation & Developer Portal — 200,000 $FNDRY

## 🏭 Phase 2 Bounty — 🟢 Tier 1 **Reward:** 200,000 $FNDRY **Tier:** T1 — Open Race (FCFS) — first quality PR wins **Phase:** 2 — Core Platform --- ### Description Polish the FastAPI auto-generated docs into a proper developer portal. External developers and future AI agents need clear API documentation to interact with the marketplace. ### Requirements - [ ] OpenAPI/Swagger docs fully annotated (descriptions, examples, response schemas) - [ ] Every endpoint documented with request/response exa