Add auto-migration on server startup

Run Drizzle migrations before seeding admin user so tables exist
on fresh database. Migration files generated from current schema.

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

apps/server/src/index.ts

@@ -6,6 +6,7 @@ import { auth } from './routes/auth';
 import { savesRouter } from './routes/saves';
 import { leaderboardRouter } from './routes/leaderboard';
 import { invitesRouter } from './routes/invites';
+import { runMigrations } from './db';
 import { seedAdmin } from './db/seed';
 
 if (!process.env.JWT_SECRET) {
@@ -40,6 +41,7 @@ const port = Number(process.env.PORT) || 3001;
 
 console.log(`AI Tycoon API server starting on port ${port}...`);
 
+await runMigrations();
 await seedAdmin();
 
 serve({ fetch: app.fetch, port });