Adding inventory microservice

microservices/InventoryApi/Models/ConsumeInventoryItemRequest.cs

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+namespace InventoryApi.Models;
+
+public class ConsumeInventoryItemRequest
+{
+    public int Quantity { get; set; } = 1;
+}

microservices/InventoryApi/Models/EquipInventoryItemRequest.cs

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+namespace InventoryApi.Models;
+
+public class EquipInventoryItemRequest
+{
+    public string OwnerId { get; set; } = string.Empty;
+
+    public string EquipmentSlot { get; set; } = string.Empty;
+}

microservices/InventoryApi/Models/GrantInventoryItemRequest.cs

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+namespace InventoryApi.Models;
+
+public class GrantInventoryItemRequest
+{
+    public string ItemKey { get; set; } = string.Empty;
+
+    public int Quantity { get; set; } = 1;
+
+    public int? PreferredSlot { get; set; }
+}

microservices/InventoryApi/Models/InventoryItem.cs

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+using MongoDB.Bson.Serialization.Attributes;
+
+namespace InventoryApi.Models;
+
+public class InventoryItem
+{
+    [BsonId]
+    public string Id { get; set; } = Guid.NewGuid().ToString();
+
+    [BsonElement("itemKey")]
+    public string ItemKey { get; set; } = string.Empty;
+
+    [BsonElement("quantity")]
+    public int Quantity { get; set; } = 1;
+
+    [BsonElement("ownerType")]
+    public string OwnerType { get; set; } = string.Empty;
+
+    [BsonElement("ownerId")]
+    public string OwnerId { get; set; } = string.Empty;
+
+    [BsonElement("ownerUserId")]
+    public string? OwnerUserId { get; set; }
+
+    [BsonElement("slot")]
+    [BsonIgnoreIfNull]
+    public int? Slot { get; set; }
+
+    [BsonElement("equippedSlot")]
+    [BsonIgnoreIfNull]
+    public string? EquippedSlot { get; set; }
+
+    [BsonElement("createdUtc")]
+    public DateTime CreatedUtc { get; set; } = DateTime.UtcNow;
+
+    [BsonElement("updatedUtc")]
+    public DateTime UpdatedUtc { get; set; } = DateTime.UtcNow;
+}

microservices/InventoryApi/Models/InventoryItemResponse.cs

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+namespace InventoryApi.Models;
+
+public class InventoryItemResponse
+{
+    public string Id { get; set; } = string.Empty;
+
+    public string ItemKey { get; set; } = string.Empty;
+
+    public int Quantity { get; set; }
+
+    public string OwnerType { get; set; } = string.Empty;
+
+    public string OwnerId { get; set; } = string.Empty;
+
+    public int? Slot { get; set; }
+
+    public string? EquippedSlot { get; set; }
+
+    public DateTime UpdatedUtc { get; set; }
+
+    public static InventoryItemResponse FromModel(InventoryItem item) => new()
+    {
+        Id = item.Id,
+        ItemKey = item.ItemKey,
+        Quantity = item.Quantity,
+        OwnerType = item.OwnerType,
+        OwnerId = item.OwnerId,
+        Slot = item.Slot,
+        EquippedSlot = item.EquippedSlot,
+        UpdatedUtc = item.UpdatedUtc
+    };
+}

microservices/InventoryApi/Models/InventoryMutationResult.cs

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+namespace InventoryApi.Models;
+
+public enum InventoryMutationStatus
+{
+    Ok,
+    ItemNotFound,
+    Invalid,
+    Conflict
+}
+
+public class InventoryMutationResult
+{
+    public InventoryMutationStatus Status { get; init; } = InventoryMutationStatus.Ok;
+
+    public string OwnerType { get; init; } = string.Empty;
+
+    public string OwnerId { get; init; } = string.Empty;
+
+    public List<InventoryItem> Items { get; init; } = [];
+
+    public static implicit operator InventoryMutationStatus(InventoryMutationResult result) => result.Status;
+}

microservices/InventoryApi/Models/InventoryOwnerResponse.cs

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+namespace InventoryApi.Models;
+
+public class InventoryOwnerResponse
+{
+    public string OwnerType { get; set; } = string.Empty;
+
+    public string OwnerId { get; set; } = string.Empty;
+
+    public List<InventoryItemResponse> Items { get; set; } = [];
+}

microservices/InventoryApi/Models/MoveInventoryItemRequest.cs

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+namespace InventoryApi.Models;
+
+public class MoveInventoryItemRequest
+{
+    public string ItemId { get; set; } = string.Empty;
+
+    public int ToSlot { get; set; }
+
+    public int? Quantity { get; set; }
+}

microservices/InventoryApi/Models/OwnerAccessResult.cs

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+namespace InventoryApi.Models;
+
+public class OwnerAccessResult
+{
+    public bool IsSupported { get; init; }
+
+    public bool Exists { get; init; }
+
+    public bool IsAuthorized { get; init; }
+
+    public string OwnerType { get; init; } = string.Empty;
+
+    public string OwnerId { get; init; } = string.Empty;
+
+    public string? OwnerUserId { get; init; }
+}

microservices/InventoryApi/Models/TransferInventoryItemRequest.cs

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+namespace InventoryApi.Models;
+
+public class TransferInventoryItemRequest
+{
+    public string ItemId { get; set; } = string.Empty;
+
+    public string FromOwnerType { get; set; } = string.Empty;
+
+    public string FromOwnerId { get; set; } = string.Empty;
+
+    public string ToOwnerType { get; set; } = string.Empty;
+
+    public string ToOwnerId { get; set; } = string.Empty;
+
+    public int? ToSlot { get; set; }
+
+    public int? Quantity { get; set; }
+}

microservices/InventoryApi/Models/TransferInventoryResponse.cs

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+namespace InventoryApi.Models;
+
+public class TransferInventoryResponse
+{
+    public string MovedItemId { get; set; } = string.Empty;
+
+    public string FromOwnerType { get; set; } = string.Empty;
+
+    public string FromOwnerId { get; set; } = string.Empty;
+
+    public string ToOwnerType { get; set; } = string.Empty;
+
+    public string ToOwnerId { get; set; } = string.Empty;
+
+    public List<InventoryItemResponse> FromItems { get; set; } = [];
+
+    public List<InventoryItemResponse> ToItems { get; set; } = [];
+}

microservices/InventoryApi/Models/UnequipInventoryItemRequest.cs

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+namespace InventoryApi.Models;
+
+public class UnequipInventoryItemRequest
+{
+    public string OwnerId { get; set; } = string.Empty;
+
+    public int? PreferredSlot { get; set; }
+}