feat: add Phase 2 migration, make urls command, fix seed script

- Create loyalty_003 migration: company-based architecture (adds
  company_id to all loyalty tables, creates company_loyalty_settings,
  renames vendor_id to enrolled_at_vendor_id on cards)
- Move platform migration back to alembic/versions (not loyalty-specific)
- Add version_locations to alembic.ini for module migration discovery
- Add make urls/urls-dev/urls-prod commands (scripts/show_urls.py)
- Fix seed_demo.py: import all module models to resolve SQLAlchemy
  string relationships, fix multiple admin query, set platform_id
  on vendor content pages
- Fix loyalty test fixtures to match Phase 2 model columns

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

Makefile

@@ -1,7 +1,7 @@
 # Wizamart Multi-Tenant E-Commerce Platform Makefile
 # Cross-platform compatible (Windows & Linux)
 
-.PHONY: install install-dev install-docs install-all dev test test-coverage lint format check docker-build docker-up docker-down clean help tailwind-install tailwind-dev tailwind-build tailwind-watch arch-check arch-check-file arch-check-object test-db-up test-db-down test-db-reset test-db-status celery-worker celery-beat celery-dev flower celery-status celery-purge
+.PHONY: install install-dev install-docs install-all dev test test-coverage lint format check docker-build docker-up docker-down clean help tailwind-install tailwind-dev tailwind-build tailwind-watch arch-check arch-check-file arch-check-object test-db-up test-db-down test-db-reset test-db-status celery-worker celery-beat celery-dev flower celery-status celery-purge urls
 
 # Detect OS
 ifeq ($(OS),Windows_NT)
@@ -477,6 +477,15 @@ verify-setup:
 	@echo "Running setup verification..."
 	@$(PYTHON) scripts/verify_setup.py
 
+urls:
+	@$(PYTHON) scripts/show_urls.py
+
+urls-dev:
+	@$(PYTHON) scripts/show_urls.py --dev
+
+urls-prod:
+	@$(PYTHON) scripts/show_urls.py --prod
+
 check-env:
 	@echo "Checking Python environment..."
 	@echo "Detected OS: $(DETECTED_OS)"
@@ -572,6 +581,9 @@ help:
 	@echo "  docker-down          - Stop Docker containers"
 	@echo ""
 	@echo "=== UTILITIES ==="
+	@echo "  urls                 - Show all platform/vendor/storefront URLs"
+	@echo "  urls-dev             - Show development URLs only"
+	@echo "  urls-prod            - Show production URLs only"
 	@echo "  clean                - Clean build artifacts"
 	@echo "  check-env            - Check Python environment and OS"
 	@echo ""