docs: Phase 10 — DataMigration + EF Staging + PackagePurchaseDialog + UI Fixes

Updated 8 docs:
- CHANGELOG: Phase 10a-d (DataMigration tool, EF staging migrations, PackagePurchaseDialog, 4 UI fixes)
- PAYMENT-FINANCE: Rial→Toman conversion chain documented, PackagePurchaseDialog status
- TECH-02: Added PackagePurchaseDialog to folder structure + status table
- TECH-04: DataMigration tool features (smart retry, FK handling, fallback tables), EF staging
- PACKAGE-TASKS: Phase 10 graph, NuGet v0.0.189, T4.1+T4.2 marked ✅
- BIZ-PACKAGE: v6→v7, commits updated, T4.1+T4.2 marked ✅
- INDEX: Updated last-update + R3 description
- ROADMAP: Progress bars updated, DONE section + NOW section refreshed

technical/TECH-02-BACKOFFICE-FRONTOFFICE.md

@@ -1,7 +1,7 @@
 # 🖥️ BackOffice و FrontOffice — معماری UI
 
 > **منابع ادغام‌شده:** `BACKOFFICE-ARCHITECTURE.md`, `BACKOFFICE-STORE-UNIFICATION.md`, `UI-MODERNIZATION-PLAN.md`, `UI-UNIFICATION-PLAN.md`, `PHASE-1-COMPLETE.md`, `PHASE-3-COMPLETE.md`, `PRODUCT-IMAGES-SQUARE.md`  
-> **آخرین بروزرسانی:** اسفند ۱۴۰۴ (بروزرسانی: UserAutoComplete + فعال‌سازی درگاه)
+> **آخرین بروزرسانی:** اسفند ۱۴۰۴ (بروزرسانی: PackagePurchaseDialog + UI Fixes + Toman/Rial)
 
 ---
 
@@ -134,6 +134,7 @@ FrontOffice/src/FrontOffice/
 └── Shared/
     ├── AppImage.razor
     ├── ProductCard.razor      ← مشترک بین Store و DiscountStore
+    ├── PackagePurchaseDialog.razor ← دیالوگ ۲-مرحله‌ای خرید پکیج (NEW)
     └── LoadMoreButton.razor
 ```
 
@@ -263,6 +264,8 @@ if (user.Identity?.IsAuthenticated == true) {
 | UserAutoComplete کامپوننت | ✅ | 100% |
 | نمایش نام کاربر در Wallet | ✅ | 100% |
 | فعال‌سازی دکمه‌های درگاه | ✅ | 100% |
+| PackagePurchaseDialog | ✅ | 100% |
+| Toman/Rial فیکس نمایش قیمت | ✅ | 100% |
 | Mobile Responsive (Phase 7) | ⬜ | 0% |
 | Dark Mode | ⬜ | 0% |
 | PWA | ⬜ | 0% |