fix: package-based compliance audit — feature DIFF, remove hardcoded fallbacks

- ActivateClubMembership: replace GetAllFeatureIds with PackageFeature DIFF (Q20)
- ActivateClubMembership: fix re-activation early return — check current cycle
- AcceptClubMembershipContract: same feature DIFF logic
- VerifyPackagePurchase: remove ?? 2.0m fallback, throw if package null
- PackageService: remove ?? 2.0m fallback for DiscountMultiplier
- UserOrderService: remove ?? 1B fallback for MagicWalletMaxDeposit
- SystemConstants: remove 9 dead [Obsolete] constants (per-package values)

src/CMSMicroservice.Application/PackageCQ/Commands/VerifyPackagePurchase/VerifyPackagePurchaseCommandHandler.cs

@@ -101,7 +101,9 @@ public class VerifyPackagePurchaseCommandHandler
 
             // شارژ DiscountBalance (موجودی تخفیف) — ضریب تخفیف از پکیج
             var oldDiscountBalance = wallet.DiscountBalance;
-            var discountMultiplier = order.Package?.DiscountMultiplier ?? 2.0m;
+            if (order.Package == null)
+                throw new NotFoundException("پکیج مرتبط با سفارش یافت نشد");
+            var discountMultiplier = order.Package.DiscountMultiplier;
             var discountAmount = (long)(order.Amount * discountMultiplier);
             wallet.DiscountBalance += discountAmount;