Enhance role management by adding pricing fields and updating related logic

- Updated `CreateRoleCommand` and `UpdateRoleCommand` to include optional pricing fields: `PricePerConfigPerQuarter` and `PricePerConfigPerYear`.
- Modified `RoleEndpoints` to handle the new pricing parameters during role creation and updates.
- Enhanced validation logic in `CreateRoleCommandValidator` and `UpdateRoleCommandValidator` to ensure pricing fields are non-negative when provided.
- Updated `RoleDto` and `SelectableRoleDto` to include pricing information, ensuring proper data handling in API responses.
- Adjusted frontend components to support new pricing fields in role forms and display total costs based on configurations.
- Updated API documentation to reflect changes in role management endpoints and pricing structure.

backend/src/PnvPanel.Application/Support/ListSelectableRoles/SelectableRoleDto.cs

@@ -0,0 +1,5 @@
+namespace PnvPanel.Application.Support.ListSelectableRoles;
+
+/// <summary>Роль для выбора в заявке на роль. Без справочной цены (RoleDto.PricePerConfigPer*) —
+/// она видна только админу, этот эндпоинт доступен любому активированному пользователю.</summary>
+public sealed record SelectableRoleDto(Guid Id, string Name, int MaxConfigs, int MaxIpLimit);