Implement billing functionality and enhance role management

- Introduced billing capabilities, allowing users to request payments for subscription periods (3/6/12 months) with admin approval via Telegram.
- Updated role management to include a `BillingEnabled` property, preventing billing for admin roles.
- Enhanced the `CreateRoleCommand` and `UpdateRoleCommand` to accept billing parameters, ensuring proper handling during role creation and updates.
- Added new endpoints for billing management and integrated billing checks into VPN config creation to enforce payment requirements.
- Updated related services, models, and tests to support the new billing features, ensuring comprehensive coverage and functionality.
- Enhanced documentation to reflect the new billing processes and role management changes.

backend/tests/PnvPanel.Application.Tests/Admin/Support/ApproveRoleRequestCommandHandlerTests.cs

@@ -27,8 +27,8 @@ public class ApproveRoleRequestCommandHandlerTests
 
         var newRoleId = Guid.NewGuid();
         _roleService
-            .CreateRoleAsync("premium", 10, 5, Arg.Any<CancellationToken>())
-            .Returns(Result.Success(new RoleDto(newRoleId, "premium", 10, 5, false)));
+            .CreateRoleAsync("premium", 10, 5, false, Arg.Any<CancellationToken>())
+            .Returns(Result.Success(new RoleDto(newRoleId, "premium", 10, 5, false, false)));
         _roleService
             .ChangeUserRoleAsync(userId, newRoleId, Arg.Any<CancellationToken>())
             .Returns(Result.Success());
@@ -51,7 +51,7 @@ public class ApproveRoleRequestCommandHandlerTests
         Assert.Equal(TicketStatus.Resolved, ticket.Status);
         await _roleService
             .Received(1)
-            .CreateRoleAsync("premium", 10, 5, Arg.Any<CancellationToken>());
+            .CreateRoleAsync("premium", 10, 5, false, Arg.Any<CancellationToken>());
         await _roleService
             .Received(1)
             .ChangeUserRoleAsync(userId, newRoleId, Arg.Any<CancellationToken>());
@@ -100,6 +100,7 @@ public class ApproveRoleRequestCommandHandlerTests
                 Arg.Any<string>(),
                 Arg.Any<int>(),
                 Arg.Any<int>(),
+                Arg.Any<bool>(),
                 Arg.Any<CancellationToken>()
             );
     }