Push API changes

* Fix item repair cost formula
* Add "RequestUpdateAvailableFreeLoadout" function (WIP)
* Fix item sell formula
* Fix item stack split on sell
* Fix contract progression counting for objectives other than owned items
* Refactor balance into a proper struct
* Separate and update Season 2 and Season 3 data

src/Prospect.Server.Api/Controllers/ClientController.cs

@@ -6,6 +6,7 @@ using Microsoft.Extensions.Options;
 using Prospect.Server.Api.Config;
 using Prospect.Server.Api.Models.Client;
 using Prospect.Server.Api.Models.Client.Data;
+using Prospect.Server.Api.Models.Data;
 using Prospect.Server.Api.Services.Auth;
 using Prospect.Server.Api.Services.Auth.Extensions;
 using Prospect.Server.Api.Services.Auth.User;
@@ -296,7 +297,7 @@ public class ClientController : Controller
             Data = new FGetUserInventoryResult
             {
                 Inventory = items,
-                VirtualCurrency = JsonSerializer.Deserialize<Dictionary<string, int>>(userData["Balance"].Value),
+                VirtualCurrency = JsonSerializer.Deserialize<PlayerBalance>(userData["Balance"].Value),
                 VirtualCurrencyRechargeTimes = new Dictionary<string, FVirtualCurrencyRechargeTime>()
             }
         });