feat(T4.2+T4.3+F3): conditional payment, re-purchase, PV display

T4.2: Conditional Payment in Checkout
- Load package flags via PackageService.GetAllPackagesAsync
- Respect SupportsDirectPurchase/SupportsDayaPurchase flags
- Add Daya loan payment button when supported
- Show alert when no payment method available

T4.3: MyPackages Re-Purchase Logic
- Load MagicWallet status to detect cycle completion
- Show re-purchase CTA when magic cycle is complete
- Show magic wallet progress bar during active cycle
- Display deposit progress, remaining, and credited amounts

F3: PV Display in Order Details
- Add CalculateOrderPVAsync to OrderService
- Show per-product PV and total PV in Store OrderDetail
- Update NuGet to v0.0.188

src/FrontOffice.Main/Pages/Checkout.razor

@@ -207,11 +207,32 @@
                                        FullWidth="true"
                                        StartIcon="@Icons.Material.Filled.Payment"
                                        OnClick="ProcessPayment"
-                                       Disabled="@(!CanProceedToPayment || _isProcessingPayment)"
+                                       Disabled="@(!CanProceedToPayment || _isProcessingPayment || !_selectedPackage.SupportsDirectPurchase)"
                                        Class="mt-2">
                                 @(_isProcessingPayment ? "در حال پردازش..." : "پرداخت آنلاین")
                             </MudButton>
 
+                            @if (_selectedPackage.SupportsDayaPurchase)
+                            {
+                                <MudButton Variant="Variant.Filled"
+                                           Color="Color.Tertiary"
+                                           Size="Size.Large"
+                                           FullWidth="true"
+                                           StartIcon="@Icons.Material.Filled.Diamond"
+                                           OnClick="DayaLoanPayment"
+                                           Disabled="@(!CanProceedToPayment)"
+                                           Class="mt-2">
+                                    تأمین اعتبار الماسی دایا
+                                </MudButton>
+                            }
+
+                            @if (!_selectedPackage.SupportsDirectPurchase && !_selectedPackage.SupportsDayaPurchase)
+                            {
+                                <MudAlert Severity="Severity.Warning" Dense="true" Class="mt-2">
+                                    این پکیج در حال حاضر قابل خرید نیست.
+                                </MudAlert>
+                            }
+
                             @if (!CanProceedToPayment)
                             {
                                 <MudText Typo="Typo.caption" Color="Color.Error" Align="Align.Center">