Enhance user plan management and update related endpoints

- Added new configuration options for user plans in `.env.example`, including `Plans__MaxCustomConfigCount` and `Plans__MinCustomConfigCount`.
- Introduced `MapPlanEndpoints` in `Program.cs` to handle plan-related API routes.
- Implemented `SetUserPlan` endpoint in `RoleEndpoints` to allow admins to assign plans to users.
- Removed deprecated role request approval endpoints from `AdminSupportEndpoints`.
- Updated `ITelegramNotifier` and related classes to reflect changes in role request handling and payment notifications.
- Refactored role management commands to remove `MaxConfigs` and focus on `MaxIpLimit` and billing settings.
- Enhanced billing request handling to accommodate plan changes instead of role changes.
- Updated various interfaces and command handlers to support new plan management features.

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

@@ -16,33 +16,7 @@ public class SupportTicketTests
         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);
+        Assert.Null(ticket.RequestedDays);
     }
 
     [Fact]
@@ -56,8 +30,6 @@ public class SupportTicketTests
         Assert.Equal(TicketType.ExtensionRequest, ticket.Type);
         Assert.Equal(TicketStatus.Open, ticket.Status);
         Assert.Equal(14, ticket.RequestedDays);
-        Assert.Null(ticket.RequestedRoleId);
-        Assert.Null(ticket.ProposedRoleName);
     }
 
     [Fact]