feat: first client onboarding — fix env, add loyalty admin, dev infra-check

- Fix .env: wizamart→orion/wizard.lu, Redis port→6380
- Fix .env.example: orion.lu→wizard.lu domain references
- Add create_loyalty_admin() to init_production.py (platform-scoped admin for rewardflow.lu)
- Add `make infra-check` target running verify-server.sh
- Split verify-server.sh into dev/prod modes (auto-detected from DEBUG flag)
- Dev checks: .env config, PostgreSQL, Redis, health endpoint, migrations
- Remove stale init.sql volume mount from docker-compose.yml

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

.env.example

@@ -24,7 +24,7 @@ DATABASE_URL=postgresql://orion_user:secure_password@localhost:5432/orion_db
 # =============================================================================
 # These are used by init_production.py to create the platform admin
 # ⚠️  CHANGE THESE IN PRODUCTION!
-ADMIN_EMAIL=admin@orion.lu
+ADMIN_EMAIL=admin@wizard.lu
 ADMIN_USERNAME=admin
 ADMIN_PASSWORD=change-me-in-production
 ADMIN_FIRST_NAME=Platform
@@ -49,9 +49,9 @@ API_PORT=8000
 # Development
 DOCUMENTATION_URL=http://localhost:8001
 # Staging
-# DOCUMENTATION_URL=https://staging-docs.orion.lu
+# DOCUMENTATION_URL=https://staging-docs.wizard.lu
 # Production
-# DOCUMENTATION_URL=https://docs.orion.lu
+# DOCUMENTATION_URL=https://docs.wizard.lu
 
 # =============================================================================
 # RATE LIMITING
@@ -70,7 +70,7 @@ LOG_FILE=logs/app.log
 # PLATFORM DOMAIN CONFIGURATION
 # =============================================================================
 # Your main platform domain
-PLATFORM_DOMAIN=orion.lu
+PLATFORM_DOMAIN=wizard.lu
 
 # Custom domain features
 # Enable/disable custom domains
@@ -85,7 +85,7 @@ SSL_PROVIDER=letsencrypt
 AUTO_PROVISION_SSL=False
 
 # DNS verification
-DNS_VERIFICATION_PREFIX=_orion-verify
+DNS_VERIFICATION_PREFIX=_wizard-verify
 DNS_VERIFICATION_TTL=3600
 
 # =============================================================================
@@ -103,8 +103,8 @@ STRIPE_TRIAL_DAYS=30
 # =============================================================================
 # Provider: smtp, sendgrid, mailgun, ses
 EMAIL_PROVIDER=smtp
-EMAIL_FROM_ADDRESS=noreply@orion.lu
-EMAIL_FROM_NAME=Orion
+EMAIL_FROM_ADDRESS=noreply@wizard.lu
+EMAIL_FROM_NAME=Wizard
 EMAIL_REPLY_TO=
 
 # SMTP Settings (used when EMAIL_PROVIDER=smtp)