feat:Initial commit

StoreService/Models/CreateOrderRequest.cs

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+using System.ComponentModel.DataAnnotations;
+
+namespace StoreService.Models;
+
+/// <summary>
+/// Request body to create a new order consisting of store item identifiers.
+/// </summary>
+public class CreateOrderRequest
+{
+    /// <summary>Identifier of the user creating the order.</summary>
+    [Required]
+    public long UserId { get; set; }
+
+    /// <summary>Collection of store item ids to include (unique). Duplicates are ignored.</summary>
+    [Required]
+    [MinLength(1)]
+    public List<long> StoreItemIds { get; set; } = new();
+}
+

StoreService/Models/OrderDto.cs

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+namespace StoreService.Models;
+
+/// <summary>
+/// Result DTO representing an order summary.
+/// </summary>
+public class OrderDto
+{
+    public long Id { get; set; }
+    public long UserId { get; set; }
+    public DateTime CostUpdateDate { get; set; }
+    public DateTime? PaidDate { get; set; }
+    public bool ItemsRedeemed { get; set; }
+    public List<OrderItemDto> Items { get; set; } = new();
+}
+

StoreService/Models/OrderItemDto.cs

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+namespace StoreService.Models;
+
+/// <summary>
+/// Order line DTO.
+/// </summary>
+public class OrderItemDto
+{
+    public long Id { get; set; }
+    public long StoreItemId { get; set; }
+    public int CalculatedPrice { get; set; }
+    public List<long> AppliedDiscountIds { get; set; } = new();
+}
+

StoreService/Models/OrderModels.cs

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+// Legacy aggregated models file kept intentionally empty after splitting into individual files.
+// CreateOrderRequest, OrderDto, and OrderItemDto now reside in separate files.
+