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/tests/PnvPanel.Domain.Tests/Support/SupportTicketTests.cs

@@ -0,0 +1,124 @@
+using PnvPanel.Domain.Exceptions;
+using PnvPanel.Domain.Support;
+using Xunit;
+
+namespace PnvPanel.Domain.Tests.Support;
+
+public class SupportTicketTests
+{
+    [Fact]
+    public void CreateBugReport_SetsOpenStatus()
+    {
+        var userId = Guid.NewGuid();
+
+        var ticket = SupportTicket.CreateBugReport(userId);
+
+        Assert.Equal(userId, ticket.UserId);
+        Assert.Equal(TicketType.BugReport, ticket.Type);
+        Assert.Equal(TicketStatus.Open, ticket.Status);
+        Assert.Null(ticket.RequestedRoleId);
+        Assert.Null(ticket.ProposedRoleName);
+    }
+
+    [Fact]
+    public void CreateRoleRequestForExistingRole_SetsRequestedRoleId()
+    {
+        var userId = Guid.NewGuid();
+        var roleId = Guid.NewGuid();
+
+        var ticket = SupportTicket.CreateRoleRequestForExistingRole(userId, roleId);
+
+        Assert.Equal(TicketType.RoleRequest, ticket.Type);
+        Assert.Equal(roleId, ticket.RequestedRoleId);
+        Assert.Null(ticket.ProposedRoleName);
+    }
+
+    [Fact]
+    public void CreateRoleRequestForNewRole_SetsProposedFields()
+    {
+        var ticket = SupportTicket.CreateRoleRequestForNewRole(Guid.NewGuid(), "premium", 5, 3);
+
+        Assert.Equal(TicketType.RoleRequest, ticket.Type);
+        Assert.Null(ticket.RequestedRoleId);
+        Assert.Equal("premium", ticket.ProposedRoleName);
+        Assert.Equal(5, ticket.ProposedMaxConfigs);
+        Assert.Equal(3, ticket.ProposedMaxIpLimit);
+    }
+
+    [Fact]
+    public void Resolve_WhenOpen_SetsResolved()
+    {
+        var ticket = SupportTicket.CreateBugReport(Guid.NewGuid());
+
+        ticket.Resolve();
+
+        Assert.Equal(TicketStatus.Resolved, ticket.Status);
+    }
+
+    [Fact]
+    public void Resolve_WhenNotOpen_Throws()
+    {
+        var ticket = SupportTicket.CreateBugReport(Guid.NewGuid());
+        ticket.Resolve();
+
+        Assert.Throws<DomainException>(() => ticket.Resolve());
+    }
+
+    [Fact]
+    public void Close_WhenOpen_SetsClosed()
+    {
+        var ticket = SupportTicket.CreateBugReport(Guid.NewGuid());
+
+        ticket.Close();
+
+        Assert.Equal(TicketStatus.Closed, ticket.Status);
+    }
+
+    [Fact]
+    public void Close_WhenResolved_SetsClosed()
+    {
+        var ticket = SupportTicket.CreateBugReport(Guid.NewGuid());
+        ticket.Resolve();
+
+        ticket.Close();
+
+        Assert.Equal(TicketStatus.Closed, ticket.Status);
+    }
+
+    [Fact]
+    public void Close_WhenAlreadyClosed_Throws()
+    {
+        var ticket = SupportTicket.CreateBugReport(Guid.NewGuid());
+        ticket.Close();
+
+        Assert.Throws<DomainException>(() => ticket.Close());
+    }
+
+    [Fact]
+    public void Reopen_WhenResolved_SetsOpen()
+    {
+        var ticket = SupportTicket.CreateBugReport(Guid.NewGuid());
+        ticket.Resolve();
+
+        ticket.Reopen();
+
+        Assert.Equal(TicketStatus.Open, ticket.Status);
+    }
+
+    [Fact]
+    public void Reopen_WhenOpen_Throws()
+    {
+        var ticket = SupportTicket.CreateBugReport(Guid.NewGuid());
+
+        Assert.Throws<DomainException>(() => ticket.Reopen());
+    }
+
+    [Fact]
+    public void Reopen_WhenClosed_Throws()
+    {
+        var ticket = SupportTicket.CreateBugReport(Guid.NewGuid());
+        ticket.Close();
+
+        Assert.Throws<DomainException>(() => ticket.Reopen());
+    }
+}