Add demo orders creation scripts

- Created management command for generating demo orders
- Added SQL script to create 25 orders with random dates (±15 days)
- Added Python runner script for executing SQL
- Demo orders include varied statuses, payment methods, and delivery types
- Orders distributed across different dates for testing date filter

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

myproject/orders/management/commands/__init__.py

@@ -0,0 +1 @@
+# Management commands