Add root CLAUDE.md and rename spec CLAUDE.md

Created project-level CLAUDE.md with current architecture, quick start,
gotchas, and conventions. Renamed dancechamp-claude-code/CLAUDE.md to
SPEC-CLAUDE.md to distinguish target spec from current project context.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

CLAUDE.md

@@ -0,0 +1,75 @@
+# CLAUDE.md — Pole Dance Championships App
+
+## Target Vision
+See `dancechamp-claude-code/` for full spec (3-app Supabase platform).
+Current implementation is a simplified MVP working toward that goal.
+
+## Quick Start
+
+```bash
+# Backend
+cd backend && .venv/Scripts/python -m uvicorn app.main:app --host 0.0.0.0 --port 8000 --reload
+
+# Mobile (set BASE_URL in src/api/client.ts to LAN IP first)
+cd mobile && npx expo start --lan --clear
+
+# Seed test data
+cd backend && .venv/Scripts/python seed.py
+```
+
+## Current Architecture
+
+- **Backend**: FastAPI + SQLAlchemy 2 (async) + aiosqlite (SQLite dev) + Alembic + bcrypt
+- **Mobile**: Expo (blank-typescript) + React Navigation v6 + Zustand + Axios + Ionicons
+- **Auth**: JWT access (15min) + refresh token rotation (7 days, SHA-256 hashed in DB)
+
+## Project Layout
+
+```
+backend/app/           FastAPI app (models, schemas, routers, crud, services)
+backend/alembic/       Async migrations
+backend/.venv/         Virtual env (use .venv/Scripts/python)
+mobile/src/api/        Axios client + API modules (auth, championships, users)
+mobile/src/store/      Zustand auth store
+mobile/src/screens/    auth/, championships/, admin/, profile/
+mobile/src/navigation/ RootNavigator -> AuthStack | AppStack (Tabs + Detail)
+dancechamp-claude-code/ Target spec: SPEC.md, PLAN.md, DATABASE.md, DESIGN-SYSTEM.md, SCREENS.md
+```
+
+## Gotchas
+
+- **passlib + bcrypt 5.x incompatible** — use `bcrypt` directly (NOT passlib)
+- **Circular import**: auth_service.py must NOT import crud_user
+- **SQLAlchemy UUID**: Use `sqlalchemy.Uuid(as_uuid=True)` not `postgresql.UUID`
+- **Expo newArchEnabled: true** crashes Expo Go — keep `false` in app.json
+- **Stale uvicorn**: Kill with `powershell.exe -NoProfile -Command "Get-Process python | Stop-Process -Force"`
+- **BASE_URL**: mobile/src/api/client.ts must use LAN IP (not localhost) for physical devices
+
+## Test Credentials (run seed.py)
+
+```
+admin@pole.dev / Admin1234       (admin, approved)
+organizer@pole.dev / Org1234     (organizer, approved)
+member@pole.dev / Member1234     (member, approved)
+```
+
+## API Routes
+
+- Auth: POST /api/v1/auth/{register,login,refresh,logout,me}
+- Championships: GET/POST/PATCH/DELETE /api/v1/championships
+- Registrations: POST/GET/PATCH/DELETE /api/v1/registrations
+- Users (admin): GET /api/v1/users, PATCH /api/v1/users/{id}/{approve,reject}
+- Health: GET /internal/health | Swagger: GET /docs
+
+## Code Conventions
+
+- Backend: Pydantic v2 schemas, async SQLAlchemy, `from_attributes = True`
+- Mobile: Functional components, Zustand stores, Ionicons for icons
+- Registration: members auto-approved, organizers require admin approval
+- Tab navigator uses `headerShown: true` for safe area; no manual headings in tab screens
+
+## Environment
+
+- Windows 10, Python 3.12, Node.js
+- Docker NOT installed, PostgreSQL NOT installed (use SQLite for dev)
+- venv always in backend/.venv