calcom: add DATABASE_DIRECT_URL (required by Prisma; migrations failed without it)

Cal.com's prisma schema declares directUrl=env(DATABASE_DIRECT_URL); without it the
startup 'prisma migrate deploy' fails (P1012) and the schema stays incomplete -> the app
500s. Set to the same direct Postgres URL. Pre-existing, never caught (bad image pin
meant calcom never deployed).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

templates/calcom/docker-compose.yml

@@ -21,6 +21,9 @@ services:
       - NEXTAUTH_SECRET=${NEXTAUTH_SECRET}
       - CALENDSO_ENCRYPTION_KEY=${CALENDSO_ENCRYPTION_KEY}
       - DATABASE_URL=postgresql://calcom:${DB_PASSWORD}@calcom-postgres:5432/calcom
+      # Cal.com's Prisma schema requires directUrl too; without it `prisma migrate deploy` fails on
+      # startup and the DB schema stays incomplete (500s on /api/health). Same direct Postgres URL.
+      - DATABASE_DIRECT_URL=postgresql://calcom:${DB_PASSWORD}@calcom-postgres:5432/calcom
       - NEXT_PUBLIC_WEBAPP_URL=https://${SUBDOMAIN}.${DOMAIN}
       - NEXTAUTH_URL=https://${SUBDOMAIN}.${DOMAIN}
       # App-email (managed relay). Injected by the controller only when app-email is on (global + per-app);