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/prisma/seed.js

@@ -5,10 +5,65 @@ const prisma = new PrismaClient();
 async function main() {
   console.log('🌱 Seeding database...');
 
+  // Create divisions
+  const divisions = await Promise.all([
+    prisma.division.upsert({
+      where: { name: 'Newcomer' },
+      update: {},
+      create: { name: 'Newcomer', abbreviation: 'NEW', displayOrder: 1 },
+    }),
+    prisma.division.upsert({
+      where: { name: 'Novice' },
+      update: {},
+      create: { name: 'Novice', abbreviation: 'NOV', displayOrder: 2 },
+    }),
+    prisma.division.upsert({
+      where: { name: 'Intermediate' },
+      update: {},
+      create: { name: 'Intermediate', abbreviation: 'INT', displayOrder: 3 },
+    }),
+    prisma.division.upsert({
+      where: { name: 'Advanced' },
+      update: {},
+      create: { name: 'Advanced', abbreviation: 'ADV', displayOrder: 4 },
+    }),
+    prisma.division.upsert({
+      where: { name: 'All-Star' },
+      update: {},
+      create: { name: 'All-Star', abbreviation: 'ALL', displayOrder: 5 },
+    }),
+    prisma.division.upsert({
+      where: { name: 'Champion' },
+      update: {},
+      create: { name: 'Champion', abbreviation: 'CHA', displayOrder: 6 },
+    }),
+  ]);
+
+  console.log(`✅ Created ${divisions.length} divisions`);
+
+  // Create competition types
+  const competitionTypes = await Promise.all([
+    prisma.competitionType.upsert({
+      where: { name: 'Jack & Jill' },
+      update: {},
+      create: { name: 'Jack & Jill', abbreviation: 'J&J' },
+    }),
+    prisma.competitionType.upsert({
+      where: { name: 'Strictly' },
+      update: {},
+      create: { name: 'Strictly', abbreviation: 'STR' },
+    }),
+  ]);
+
+  console.log(`✅ Created ${competitionTypes.length} competition types`);
+
   // Create events
   const events = await Promise.all([
-    prisma.event.create({
-      data: {
+    prisma.event.upsert({
+      where: { slug: 'warsaw-dance-festival-2025' },
+      update: {},
+      create: {
+        slug: 'warsaw-dance-festival-2025',
         name: 'Warsaw Dance Festival 2025',
         location: 'Warsaw, Poland',
         startDate: new Date('2025-03-15'),
@@ -18,8 +73,11 @@ async function main() {
         description: 'The biggest West Coast Swing event in Central Europe',
       },
     }),
-    prisma.event.create({
-      data: {
+    prisma.event.upsert({
+      where: { slug: 'swing-camp-barcelona-2025' },
+      update: {},
+      create: {
+        slug: 'swing-camp-barcelona-2025',
         name: 'Swing Camp Barcelona 2025',
         location: 'Barcelona, Spain',
         startDate: new Date('2025-04-20'),
@@ -29,8 +87,11 @@ async function main() {
         description: 'International swing dance camp with workshops and socials',
       },
     }),
-    prisma.event.create({
-      data: {
+    prisma.event.upsert({
+      where: { slug: 'blues-week-herrang-2025' },
+      update: {},
+      create: {
+        slug: 'blues-week-herrang-2025',
         name: 'Blues Week Herräng 2025',
         location: 'Herräng, Sweden',
         startDate: new Date('2025-07-14'),
@@ -40,8 +101,11 @@ async function main() {
         description: 'Week-long blues dance intensive in the heart of Sweden',
       },
     }),
-    prisma.event.create({
-      data: {
+    prisma.event.upsert({
+      where: { slug: 'krakow-swing-connection-2025' },
+      update: {},
+      create: {
+        slug: 'krakow-swing-connection-2025',
         name: 'Krakow Swing Connection 2025',
         location: 'Krakow, Poland',
         startDate: new Date('2025-05-10'),
@@ -72,6 +136,8 @@ async function main() {
   console.log('🎉 Seeding completed successfully!');
   console.log('');
   console.log('Created:');
+  console.log(`  - ${divisions.length} divisions`);
+  console.log(`  - ${competitionTypes.length} competition types`);
   console.log(`  - ${events.length} events`);
   console.log(`  - ${chatRooms.length} chat rooms`);
 }