Implement pricing management functionality and update related components

- Added new endpoints for managing global pricing settings, including retrieval and updates for `PricePerConfigPerQuarter` and `PricePerConfigPerYear`.
- Updated `RoleService` and related commands to remove pricing fields from role management, ensuring a clear separation between role configurations and global pricing.
- Enhanced the `FactoryResetCommandHandler` to include seeding of pricing settings during a factory reset.
- Modified frontend components to support new pricing settings, including forms for creating and updating pricing information.
- Updated API documentation to reflect changes in pricing management endpoints and their expected request/response formats.
- Adjusted tests to ensure proper coverage for new pricing functionalities and their integration with existing role management features.

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

@@ -8,6 +8,7 @@ using PnvPanel.Domain.Inbounds;
 using PnvPanel.Domain.Instructions;
 using PnvPanel.Domain.News;
 using PnvPanel.Domain.Nodes;
+using PnvPanel.Domain.Pricing;
 using PnvPanel.Domain.Support;
 using PnvPanel.Domain.Telegram;
 
@@ -45,6 +46,8 @@ public interface IAppDbContext
 
     DbSet<InstructionTab> InstructionTabs { get; }
 
+    DbSet<PricingSettings> PricingSettings { get; }
+
     /// <summary>Нужен для advisory-lock при проверке квоты конфигов (см. CreateVpnConfigCommandHandler).</summary>
     DatabaseFacade Database { get; }