Enhance user management and billing integration

- Updated the `UserSummaryDto` to include `BillingEnabled` and `BillingPaidUntil` properties, allowing for better tracking of user billing status.
- Refactored the `IdentityService` to populate the new billing fields when retrieving user summaries.
- Modified the dashboard and admin user management components to display billing information, including a link to the billing page and a badge for billing status.
- Added internationalization support for new billing-related labels in both English and Russian.
- Ensured frontend components reflect the updated user data structure, enhancing user experience with billing visibility.

backend/src/PnvPanel.Application/Common/Interfaces/IIdentityService.cs

@@ -34,7 +34,9 @@ public sealed record UserSummaryDto(
     string Role,
     bool IsActivated,
     bool IsBlocked,
-    DateTimeOffset? ActivatedAt
+    DateTimeOffset? ActivatedAt,
+    bool BillingEnabled,
+    DateTimeOffset? BillingPaidUntil
 );
 
 public sealed record UserStatsDto(int Total, int Activated);

backend/src/PnvPanel.Infrastructure/Identity/IdentityService.cs

@@ -269,15 +269,17 @@ internal sealed class IdentityService(
         var items = new List<UserSummaryDto>(users.Count);
         foreach (var user in users)
         {
-            var roleName = await GetPrimaryRoleNameAsync(user);
+            var role = await GetPrimaryRoleAsync(user);
             items.Add(
                 new UserSummaryDto(
                     user.Id,
                     user.UserName!,
-                    roleName,
+                    role.Name!,
                     user.IsActivated,
                     user.IsBlocked,
-                    user.ActivatedAt
+                    user.ActivatedAt,
+                    role.BillingEnabled,
+                    user.BillingPaidUntil
                 )
             );
         }