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/Support/TicketDetailDto.cs

@@ -0,0 +1,13 @@
+using PnvPanel.Domain.Support;
+
+namespace PnvPanel.Application.Support;
+
+/// <summary>
+/// RequestedRoleName — имя существующей роли, если RequestedRoleId задан (резолвится хендлером,
+/// на SupportTicket хранится только Id). Для новой роли имя лежит прямо в ProposedRoleName.
+/// </summary>
+public sealed record TicketDetailDto(
+    Guid Id, Guid UserId, string UserName, TicketType Type, TicketStatus Status,
+    Guid? RequestedRoleId, string? RequestedRoleName,
+    string? ProposedRoleName, int? ProposedMaxConfigs, int? ProposedMaxIpLimit,
+    DateTimeOffset CreatedAt, IReadOnlyList<TicketCommentDto> Comments);