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/db/index.ts

@@ -1,4 +1,7 @@
+import path from 'node:path';
+import { fileURLToPath } from 'node:url';
 import { drizzle } from 'drizzle-orm/postgres-js';
+import { migrate } from 'drizzle-orm/postgres-js/migrator';
 import postgres from 'postgres';
 import * as schema from './schema';
 
@@ -8,3 +11,13 @@ const client = postgres(connectionString);
 export const db = drizzle(client, { schema });
 
 export type Database = typeof db;
+
+const __dirname = path.dirname(fileURLToPath(import.meta.url));
+
+export async function runMigrations() {
+  const migrationClient = postgres(connectionString, { max: 1 });
+  const migrationDb = drizzle(migrationClient);
+  await migrate(migrationDb, { migrationsFolder: path.resolve(__dirname, '../../drizzle') });
+  await migrationClient.end();
+  console.log('Database migrations complete');
+}