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.Infrastructure/Persistence/AppDbContext.cs

@@ -8,6 +8,7 @@ using PnvPanel.Domain.Configs;
 using PnvPanel.Domain.Inbounds;
 using PnvPanel.Domain.News;
 using PnvPanel.Domain.Nodes;
+using PnvPanel.Domain.Support;
 using PnvPanel.Domain.Telegram;
 using PnvPanel.Infrastructure.Identity;
 
@@ -42,6 +43,12 @@ public class AppDbContext(DbContextOptions<AppDbContext> options)
 
     public DbSet<NewsPost> NewsPosts => Set<NewsPost>();
 
+    public DbSet<SupportTicket> SupportTickets => Set<SupportTicket>();
+
+    public DbSet<TicketComment> TicketComments => Set<TicketComment>();
+
+    public DbSet<TicketAttachment> TicketAttachments => Set<TicketAttachment>();
+
     protected override void OnModelCreating(ModelBuilder modelBuilder)
     {
         base.OnModelCreating(modelBuilder);