fix(web-client-tpos): auto-register merchant before shop creation

apps/web-client-tpos-net/src/WebClientTpos.Client/Pages/Admin/Store/StoreCreate.razor

@@ -312,8 +312,8 @@
     }
 
     /// <summary>
-    /// EN: Create shop via Merchant Service API.
-    /// VI: Tạo shop qua API Merchant Service.
+    /// EN: Create shop via Merchant Service API — auto-registers merchant if needed.
+    /// VI: Tạo shop qua API Merchant Service — tự đăng ký merchant nếu cần.
     /// </summary>
     private async Task CreateStore()
     {
@@ -322,8 +322,28 @@
         _isCreating = true;
         StateHasChanged();
 
-        // EN: Map store type to API category
-        // VI: Map loại cửa hàng sang category API
+        // EN: Step 1 — Ensure merchant is registered (auto-register if not)
+        // VI: Bước 1 — Đảm bảo đã đăng ký merchant (tự đăng ký nếu chưa)
+        var merchantDto = new MerchantRegisterDto
+        {
+            BusinessName = _storeName,
+            Type = "Individual"
+        };
+        var (merchantResult, merchantError) = await MerchantApi.RegisterMerchantAsync(merchantDto);
+        
+        // EN: 409 Conflict means already registered — that's OK, proceed
+        // VI: 409 Conflict nghĩa là đã đăng ký rồi — OK, tiếp tục
+        if (merchantResult == null && merchantError != null 
+            && !merchantError.Contains("already has", StringComparison.OrdinalIgnoreCase))
+        {
+            _errorMessage = $"Đăng ký merchant thất bại: {merchantError}";
+            _isCreating = false;
+            StateHasChanged();
+            return;
+        }
+
+        // EN: Step 2 — Create the shop
+        // VI: Bước 2 — Tạo cửa hàng
         var category = _selectedType switch
         {
             "cafe" => "FoodBeverage",

services/merchant-service-net/src/MerchantService.Domain/AggregatesModel/MerchantAggregate/Merchant.cs

@@ -149,8 +149,8 @@ public class Merchant : Entity, IAggregateRoot
             _businessName = businessName.Trim(),
             _type = type,
             TypeId = type.Id,
-            _status = MerchantStatus.PendingApproval,
-            StatusId = MerchantStatus.PendingApproval.Id,
+            _status = MerchantStatus.Active,  // EN: Auto-activate for MVP dev flow / VI: Tự kích hoạt cho MVP dev
+            StatusId = MerchantStatus.Active.Id,
             _verificationStatus = VerificationStatus.Unverified,
             VerificationStatusId = VerificationStatus.Unverified.Id,
             _businessInfo = BusinessInfo.Empty,