feat(preprod): contrats fonctionnels, réputation factions, gating tech-tree & shop

- RequestPlayerContracts: renvoie les vrais contrats actifs + job boards du joueur
  (peuplement initial des boards vides) au lieu d'une liste hardcodée.
- RequestFactionProgression: renvoie la réputation réelle des 3 factions (au lieu de 0).
- StartTechTreeNodeUpgradeClient: dependency check PlayerQuarterLevelRequired.
- PurchaseWeaponShopItem: critère de déblocage par contrat (UnlockData.ContractLockPurchase).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/Prospect.Server.Api/Services/CloudScript/Functions/PurchaseWeaponShopItem.cs

@@ -3,6 +3,7 @@ using System.Text.Json.Serialization;
 using Prospect.Server.Api.Models.Data;
 using Prospect.Server.Api.Services.Auth.Extensions;
 using Prospect.Server.Api.Services.CloudScript;
+using Prospect.Server.Api.Services.CloudScript.Functions;
 using Prospect.Server.Api.Services.UserData;
 
 public class PurchaseWeaponShopItemRequest
@@ -137,7 +138,7 @@ public class PurchaseWeaponShopItemFunction : ICloudScriptFunction<PurchaseWeapo
                 Error = "Invalid purchase amount",
             };
         }
-        var userData = await _userDataService.FindAsync(userId, userId, new List<string>{"Inventory", "Balance"});
+        var userData = await _userDataService.FindAsync(userId, userId, new List<string>{"Inventory", "Balance", "ContractsOneTimeCompleted"});
         var inventory = JsonSerializer.Deserialize<List<FYCustomItemInfo>>(userData["Inventory"].Value);
         var balance = JsonSerializer.Deserialize<PlayerBalance>(userData["Balance"].Value);
         var blueprintsData = _titleDataService.Find(new List<string>{"Blueprints"});
@@ -153,7 +154,21 @@ public class PurchaseWeaponShopItemFunction : ICloudScriptFunction<PurchaseWeapo
 
         var blueprintData = blueprints[request.BaseItemID];
 
-        // TODO: Contract unlock criteria
+        // Contract unlock criteria: some items can only be purchased after completing a
+        // specific contract. Only gate when the item explicitly declares such a lock, so
+        // items with no lock keep working as before.
+        if (!string.IsNullOrEmpty(blueprintData.UnlockData?.ContractLockPurchase))
+        {
+            var completed = JsonSerializer.Deserialize<FYGetCompletedContractsResult>(userData["ContractsOneTimeCompleted"].Value);
+            if (completed?.ContractsIDs == null || !completed.ContractsIDs.Contains(blueprintData.UnlockData.ContractLockPurchase))
+            {
+                return new PurchaseWeaponShopItemResponse
+                {
+                    UserID = userId,
+                    Error = "Item is locked: complete the required contract first",
+                };
+            }
+        }
 
         // Validate price
         var shopCraftingData = blueprintData.ItemShopsCraftingData[request.ShopItemBelongsTo];