Feature Request: Customer-Selectable Inventory Fulfillment Location

[LeonBatch]

Allow customers to select which inventory location fulfills their order, or have the system automatically select a location based on criteria such as proximity, rather than relying solely on the store-defined priority order.

Use Case

We operate multiple warehouse locations (e.g., Auckland and Wellington). Currently, Commerce 5's multi-location inventory system works as a failover mechanism — if Location A runs out of stock, it pulls from Location B based on priority order.

However, we need more control over which location ships an order. This would enable:

• Faster delivery – Customer selects (or the system auto-selects) the warehouse closest to them
• Location-specific shipping costs – Different shipping rates depending on the origin warehouse
• Stock transparency – Customer can see stock availability per location before purchasing
• Split fulfillment awareness – Customer understands when items may ship from different locations

Current Limitation

The inventory location system is entirely backend-controlled. There is currently no mechanism to:

1. Expose location-level stock to the frontend
2. Allow customer preference to influence which location commits inventory
3. Auto-select a location based on customer address or region
4. Store a location preference per line item

Suggested Capability

Provide a way to:

• Query available stock per location for a purchasable (for frontend display)
• Attach a preferred location to a line item (via options or a dedicated field)
• Have orderCompleteHandler respect that preference when committing inventory
• Optionally auto-select a location based on shipping address (e.g., nearest warehouse or same region)