Implement support ticket system with role request and bug report functionalities

- Introduced a new support ticket system allowing users to submit bug reports and role requests.
- Implemented endpoints for creating, updating, and managing support tickets, including file attachments.
- Enhanced Telegram bot integration to handle role requests directly within the bot, enabling admins to approve or reject requests without accessing the website.
- Updated database schema to include support ticket entities and their relationships.
- Improved API documentation to reflect new support ticket endpoints and their usage.
- Added necessary localization for support ticket features in both Russian and English.

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

@@ -7,6 +7,7 @@ using PnvPanel.Domain.Configs;
 using PnvPanel.Domain.Inbounds;
 using PnvPanel.Domain.News;
 using PnvPanel.Domain.Nodes;
+using PnvPanel.Domain.Support;
 using PnvPanel.Domain.Telegram;
 
 namespace PnvPanel.Application.Common.Interfaces;
@@ -33,6 +34,12 @@ public interface IAppDbContext
 
     DbSet<NewsPost> NewsPosts { get; }
 
+    DbSet<SupportTicket> SupportTickets { get; }
+
+    DbSet<TicketComment> TicketComments { get; }
+
+    DbSet<TicketAttachment> TicketAttachments { get; }
+
     /// <summary>Нужен для advisory-lock при проверке квоты конфигов (см. CreateVpnConfigCommandHandler).</summary>
     DatabaseFacade Database { get; }