Refactor pricing endpoints and enhance support for pricing retrieval

- Added a new endpoint `/api/support/pricing` to allow users to retrieve pricing information, making it accessible for role request dialogs.
- Introduced the `GetSupportPricing` method to handle pricing queries, ensuring that pricing data is available to non-admin users.
- Updated frontend components to integrate the new pricing retrieval functionality, displaying estimated costs based on user-selected configurations.
- Removed the `PricingSettingsDto` as it is no longer needed, streamlining the pricing data structure.
- Enhanced API documentation to reflect the new endpoint and its usage in the support context.

backend/src/PnvPanel.Api/Endpoints/AdminPricingEndpoints.cs

@@ -1,5 +1,6 @@
 using PnvPanel.Api.Common;
 using PnvPanel.Application.Admin.Pricing;
+using PnvPanel.Application.Common.Interfaces;
 using PnvPanel.Application.Common.Messaging;
 using PnvPanel.Infrastructure.Identity;
 

backend/src/PnvPanel.Api/Endpoints/SupportEndpoints.cs

@@ -8,6 +8,7 @@ using PnvPanel.Application.Support.AddComment;
 using PnvPanel.Application.Support.CreateBugReport;
 using PnvPanel.Application.Support.CreateRoleRequest;
 using PnvPanel.Application.Support.GetAttachment;
+using PnvPanel.Application.Support.GetSupportPricing;
 using PnvPanel.Application.Support.GetTicket;
 using PnvPanel.Application.Support.ListMyTickets;
 using PnvPanel.Application.Support.ListSelectableRoles;
@@ -23,6 +24,7 @@ public static class SupportEndpoints
         var group = app.MapGroup("/api/support").WithTags("Support").RequireAuthorization();
 
         group.MapGet("/roles", ListSelectableRoles).Produces<IReadOnlyList<RoleDto>>();
+        group.MapGet("/pricing", GetSupportPricing).Produces<PricingSettingsDto>();
         group
             .MapPost("/tickets/bug-reports", CreateBugReport)
             .DisableAntiforgery()
@@ -49,6 +51,15 @@ public static class SupportEndpoints
         return result.ToHttpResult();
     }
 
+    private static async Task<IResult> GetSupportPricing(
+        ISender sender,
+        CancellationToken cancellationToken
+    )
+    {
+        var result = await sender.Send(new GetSupportPricingQuery(), cancellationToken);
+        return result.ToHttpResult();
+    }
+
     private static async Task<IResult> CreateBugReport(
         [FromForm] string message,
         IFormFileCollection? files,

backend/src/PnvPanel.Application/Admin/Pricing/GetPricingSettingsQuery.cs

@@ -1,3 +1,4 @@
+using PnvPanel.Application.Common.Interfaces;
 using PnvPanel.Application.Common.Messaging;
 using PnvPanel.Application.Common.Models;
 

backend/src/PnvPanel.Application/Admin/Pricing/PricingSettingsDto.cs

@@ -1,17 +0,0 @@
-using PnvPanel.Domain.Pricing;
-
-namespace PnvPanel.Application.Admin.Pricing;
-
-public sealed record PricingSettingsDto(
-    int? PricePerConfigPerQuarter,
-    int? PricePerConfigPerHalfYear,
-    int? PricePerConfigPerYear
-)
-{
-    public static PricingSettingsDto FromDomain(PricingSettings settings) =>
-        new(
-            settings.PricePerConfigPerQuarter,
-            settings.PricePerConfigPerHalfYear,
-            settings.PricePerConfigPerYear
-        );
-}

backend/src/PnvPanel.Application/Admin/Pricing/UpdatePricingSettingsCommand.cs

@@ -1,3 +1,4 @@
+using PnvPanel.Application.Common.Interfaces;
 using PnvPanel.Application.Common.Messaging;
 using PnvPanel.Application.Common.Models;
 

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

@@ -0,0 +1,20 @@
+using PnvPanel.Domain.Pricing;
+
+namespace PnvPanel.Application.Common.Interfaces;
+
+/// <summary>Все поля — цена за конфиг В МЕСЯЦ при соответствующем тарифе оплаты; итог за период =
+/// ставка × число месяцев. Используется и Admin (редактирование), и Support (справка при заявке на
+/// роль) — см. PricingSettingsDto.FromDomain.</summary>
+public sealed record PricingSettingsDto(
+    int? PricePerConfigPerQuarter,
+    int? PricePerConfigPerHalfYear,
+    int? PricePerConfigPerYear
+)
+{
+    public static PricingSettingsDto FromDomain(PricingSettings settings) =>
+        new(
+            settings.PricePerConfigPerQuarter,
+            settings.PricePerConfigPerHalfYear,
+            settings.PricePerConfigPerYear
+        );
+}

backend/src/PnvPanel.Application/Support/GetSupportPricing/GetSupportPricingQuery.cs

@@ -0,0 +1,9 @@
+using PnvPanel.Application.Common.Interfaces;
+using PnvPanel.Application.Common.Messaging;
+using PnvPanel.Application.Common.Models;
+
+namespace PnvPanel.Application.Support.GetSupportPricing;
+
+/// <summary>Справочная цена конфига для заявки на роль (не редактирование, только чтение) — в отличие
+/// от GetPricingSettingsQuery (Admin/Pricing), доступна любому активированному пользователю.</summary>
+public sealed record GetSupportPricingQuery : IQuery<Result<PricingSettingsDto>>, IRequiresActivation;

backend/src/PnvPanel.Application/Support/GetSupportPricing/GetSupportPricingQueryHandler.cs

@@ -0,0 +1,27 @@
+using Microsoft.EntityFrameworkCore;
+using PnvPanel.Application.Common.Interfaces;
+using PnvPanel.Application.Common.Messaging;
+using PnvPanel.Application.Common.Models;
+
+namespace PnvPanel.Application.Support.GetSupportPricing;
+
+public sealed class GetSupportPricingQueryHandler(IAppDbContext dbContext)
+    : IQueryHandler<GetSupportPricingQuery, Result<PricingSettingsDto>>
+{
+    public async Task<Result<PricingSettingsDto>> Handle(
+        GetSupportPricingQuery query,
+        CancellationToken cancellationToken
+    )
+    {
+        var settings = await dbContext
+            .PricingSettings.AsNoTracking()
+            .FirstOrDefaultAsync(cancellationToken);
+
+        // Ещё не сидировано/не сохранено ни разу — цена не задана, а не ошибка.
+        return Result.Success(
+            settings is null
+                ? new PricingSettingsDto(null, null, null)
+                : PricingSettingsDto.FromDomain(settings)
+        );
+    }
+}