[WIP] Add queue implementation to track order preparation times

[Copilot]

Cloud agent has begun work on Add a small queue im... and will update this pull request as work progresses.

Original prompt

Add a small queue implementation to the backend to track order preparation times for store management. This will allow people that are waiting for their orders to see estimated wait times based on current order volume.

• Show me the design and implementation plan Todo list.
• Implement the backend OrderQueueService to track order times.
• Create API endpoints to get current queue status and average preparation times.

The user has attached the following file paths as relevant context:

• .github\instructions\copilot-instructions.instructions.md

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