feat: trim platform modules, rename platforms, fix seed output

- Rename platforms: Orion OMS → OMS, Orion → Wizard, Loyalty+ → Loyalty
- Per-platform module assignment: core modules always enabled, optional
  modules selectively enabled per platform instead of enabling all 18
- Rename demo store Orion → WizaTech to avoid confusion with app name
- Fix false "already exist" warnings for customers/products in seed
  (broken post-flush id detection replaced with simple counter)
- Make dev port use API_PORT from .env instead of hardcoded 9999
- Add platforms section with dev URLs to init-prod summary
- Add merchant panel and customer login URLs to seed next steps
- Merge alembic heads (z_store_domain_platform_id + tenancy_001)

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

Makefile

@@ -44,7 +44,7 @@ setup: install-all migrate-up init-prod
 # =============================================================================
 
 dev:
-	$(PYTHON) -m uvicorn main:app --reload --host 0.0.0.0 --port 9999
+	$(PYTHON) -m uvicorn main:app --reload --host 0.0.0.0 --port $(or $(API_PORT),8000)
 
 # =============================================================================
 # DATABASE MIGRATIONS