feat: add competition heats system backend

- Add 3 new database tables: divisions, competition_types, event_user_heats
- Add seed data for 6 divisions (NEW, NOV, INT, ADV, ALL, CHA) and 2 competition types (J&J, STR)
- Add API endpoints for divisions and competition types
- Add heats management endpoints in events route (POST/GET/DELETE)
- Implement unique constraint: cannot have same role in same division+competition type
- Add participant verification before allowing heats management
- Support heat numbers 1-9 with optional Leader/Follower role

backend/src/app.js

@@ -77,6 +77,8 @@ app.use('/api/auth', require('./routes/auth'));
 app.use('/api/users', require('./routes/users'));
 app.use('/api/events', require('./routes/events'));
 app.use('/api/wsdc', require('./routes/wsdc'));
+app.use('/api/divisions', require('./routes/divisions'));
+app.use('/api/competition-types', require('./routes/competitionTypes'));
 // app.use('/api/matches', require('./routes/matches'));
 // app.use('/api/ratings', require('./routes/ratings'));