Fix empty Futon Manufacturing sample tables - #1522

Description

Fixes #1521.

The Futon Manufacturing sample database contained empty tables for:

• PurchaseOrder
• PurchaseOrderDetail
• QualityInspection

This change adds representative sample data for all three tables using the existing suppliers, items, warehouses, and supplier-item relationships.

Testing

• Recreated the FutonManufacturing database using 01-schema.sql
• Executed the updated 02-sample-data.sql successfully
• Verified:
  • 5 Purchase Orders
  • 10 Purchase Order Details
  • 5 Quality Inspections
• Verified the foreign-key relationships between purchase orders, suppliers, warehouses, and items.

Changes

• Added 5 purchase orders
• Added 10 purchase order detail records
• Added 5 quality inspection records