docs: add PROGRESS.md with build summary

PROGRESS.md

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+# ServeSync Demo — Build Complete ✅
+
+**Completed by Forge on 2026-03-19**
+
+## Live URLs
+- **App:** http://servesync-demo.juankibin.space (domain)
+- **Direct:** http://192.168.1.167:8092
+- **API Docs:** http://192.168.1.167:8092/api/docs (if enabled)
+- **Gitea:** http://192.168.1.159:3000/kibin/servesync-demo
+
+## What's Built
+
+### Backend (FastAPI + PostgreSQL + Redis)
+- `/api/players/` — Player profiles, ELO ratings, membership tiers
+- `/api/courts/` — Court management, booking, availability
+- `/api/matches/` — Full matchmaking system (open + skill-based)
+- `/api/tournaments/` — Double elimination tournament engine
+- `/api/screen/` — TV display API with real-time data
+- `/api/admin/seed` — POST to re-seed demo data
+- WebSocket endpoints: `/ws/court/{id}`, `/ws/overview`, `/ws/matches`
+
+### Frontend (Vue 3 + Tailwind)
+- `/` Dashboard — Live court grid, leaderboard, tournament summary, quick actions
+- `/courts` — Court booking with time slot selection
+- `/matchmaking` — Stage 1 Open + Stage 2 Skill-Based lobby
+- `/tournament` — Full double elimination bracket viewer with score entry
+- `/players` — Player directory with tier/ELO display
+- `/screen/:courtId` — TV display mode (court 1-4 or overview)
+
+### Seed Data
+- 12 demo players (Bronze→Elite, 850-1850 ELO)
+- 4 courts (2x Sport Court, 2x Cushioned Tournament Grade)
+- 3 active matches (Open, Skill-Based, Tournament)
+- 2 lobby matches
+- 1 in-progress tournament with full bracket
+
+## Matchmaking Implementation
+- **Stage 1 Open:** Free join, no restrictions
+- **Stage 2 Skill-Based:** ELO ±200 constraint enforced
+- **Stage 3 Tournament:** Double elimination, winners/losers brackets, Grand Final
+- Auto-assigns available court when match starts
+- ELO updates calculated via standard K=32 formula
+
+## Re-seeding
+If data gets stale or needs refresh:
+```bash
+curl -X POST http://192.168.1.167:8092/api/admin/seed
+```
+
+## Infrastructure
+- Coolify App UUID: ycw8wg8gk08gwcwc8wwwwww8
+- Gitea webhook CI/CD: Active (pushes trigger auto-deploy)
+- DB volume: `pgdata` (persistent across deployments)