Add OrderQueueService for real-time wait time estimation

[Copilot]

Adds an in-memory order queue to the backend so store management can track active orders and customers can see estimated wait times based on current order volume and historical preparation data.

New Components

• OrderQueueEntry model — tracks OrderId, EnqueuedAt, CompletedAt, Status (Pending/Completed), and computes PreparationTimeMinutes
• OrderQueueService (singleton) — thread-safe in-memory queue; retains up to 100 completed entries for rolling average calculation; defaults to 5-minute prep time when no history exists
• OrderQueueController — four new endpoints:

Method	Route	Description
GET	/api/orderqueue/status	Pending count + estimated wait + avg prep time
GET	/api/orderqueue/averagetime	Average preparation time in minutes
GET	/api/orderqueue	All queue entries (pending + completed)
POST	/api/orderqueue/{orderId}/complete	Mark order complete, records actual prep time

Modified

• OrderService.CreateOrderAsync — automatically enqueues every new order after DB save
• Program.cs — registers OrderQueueService as a singleton

Example Response — GET /api/orderqueue/status

{
  "pendingOrderCount": 3,
  "averagePreparationTimeMinutes": 4.7,
  "estimatedWaitMinutes": 14.1
}

Estimated wait is pendingCount × avgPrepTime — appropriate for a single-station preparation model.

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

Created from VS Code.

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[PagelsR]

@copilot after I delegate to the cloud, I do not want updates in chat. How to turn this off?

[Copilot]

@copilot after I delegate to the cloud, I do not want updates in chat. How to turn this off?

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