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.Application.Tests/Admin/Plans/PlanCommandHandlerTests.cs

@@ -0,0 +1,129 @@
+using PnvPanel.Application.Admin.Plans;
+using PnvPanel.Application.Tests.TestSupport;
+using PnvPanel.Domain.Plans;
+using Xunit;
+
+namespace PnvPanel.Application.Tests.Admin.Plans;
+
+public class PlanCommandHandlerTests
+{
+    [Fact]
+    public async Task Create_AddsPlan()
+    {
+        using var dbContext = InMemoryDbContextFactory.Create();
+        var handler = new CreatePlanCommandHandler(dbContext);
+
+        var result = await handler.Handle(
+            new CreatePlanCommand("Стандарт", 3, 0),
+            CancellationToken.None
+        );
+        await dbContext.SaveChangesAsync(CancellationToken.None);
+
+        Assert.True(result.IsSuccess);
+        Assert.Equal("Стандарт", result.Value.Name);
+        Assert.Equal(3, result.Value.ConfigCount);
+        Assert.True(result.Value.IsEnabled);
+        Assert.NotNull(await dbContext.Plans.FindAsync([result.Value.Id], CancellationToken.None));
+    }
+
+    [Fact]
+    public async Task Update_WhenNotFound_ReturnsNotFound()
+    {
+        using var dbContext = InMemoryDbContextFactory.Create();
+        var handler = new UpdatePlanCommandHandler(dbContext);
+
+        var result = await handler.Handle(
+            new UpdatePlanCommand(Guid.NewGuid(), "Плюс", 6, 1, true),
+            CancellationToken.None
+        );
+
+        Assert.False(result.IsSuccess);
+        Assert.Equal(PnvPanel.Application.Plans.PlanErrors.NotFound, result.Error);
+    }
+
+    [Fact]
+    public async Task Update_WhenFound_UpdatesFields()
+    {
+        using var dbContext = InMemoryDbContextFactory.Create();
+        var plan = Plan.Create("Стандарт", 3, 0);
+        dbContext.Plans.Add(plan);
+        await dbContext.SaveChangesAsync(CancellationToken.None);
+
+        var handler = new UpdatePlanCommandHandler(dbContext);
+        var result = await handler.Handle(
+            new UpdatePlanCommand(plan.Id, "Плюс", 6, 1, false),
+            CancellationToken.None
+        );
+
+        Assert.True(result.IsSuccess);
+        Assert.Equal("Плюс", result.Value.Name);
+        Assert.Equal(6, result.Value.ConfigCount);
+        Assert.False(result.Value.IsEnabled);
+    }
+
+    [Fact]
+    public async Task Delete_WhenNotFound_ReturnsNotFound()
+    {
+        using var dbContext = InMemoryDbContextFactory.Create();
+        var handler = new DeletePlanCommandHandler(dbContext);
+
+        var result = await handler.Handle(
+            new DeletePlanCommand(Guid.NewGuid()),
+            CancellationToken.None
+        );
+
+        Assert.False(result.IsSuccess);
+        Assert.Equal(PnvPanel.Application.Plans.PlanErrors.NotFound, result.Error);
+    }
+
+    [Fact]
+    public async Task Delete_WhenFound_RemovesPlan()
+    {
+        using var dbContext = InMemoryDbContextFactory.Create();
+        var plan = Plan.Create("Стандарт", 3, 0);
+        dbContext.Plans.Add(plan);
+        await dbContext.SaveChangesAsync(CancellationToken.None);
+
+        var handler = new DeletePlanCommandHandler(dbContext);
+        var result = await handler.Handle(new DeletePlanCommand(plan.Id), CancellationToken.None);
+        await dbContext.SaveChangesAsync(CancellationToken.None);
+
+        Assert.True(result.IsSuccess);
+        Assert.Null(await dbContext.Plans.FindAsync([plan.Id], CancellationToken.None));
+    }
+
+    [Fact]
+    public async Task ListAdmin_ReturnsAllPlansOrderedBySortOrder()
+    {
+        using var dbContext = InMemoryDbContextFactory.Create();
+        dbContext.Plans.AddRange(
+            Plan.Create("Про", 9, 2),
+            Plan.Create("Стандарт", 3, 0),
+            Plan.Create("Плюс", 6, 1)
+        );
+        await dbContext.SaveChangesAsync(CancellationToken.None);
+
+        var handler = new ListAdminPlansQueryHandler(dbContext);
+        var result = await handler.Handle(new ListAdminPlansQuery(), CancellationToken.None);
+
+        Assert.True(result.IsSuccess);
+        Assert.Equal(["Стандарт", "Плюс", "Про"], result.Value.Select(p => p.Name));
+    }
+
+    [Fact]
+    public async Task ListPublic_OnlyReturnsEnabledPlans()
+    {
+        using var dbContext = InMemoryDbContextFactory.Create();
+        var disabled = Plan.Create("Скрытый", 12, 3);
+        disabled.Update(disabled.Name, disabled.ConfigCount, disabled.SortOrder, isEnabled: false);
+        dbContext.Plans.AddRange(Plan.Create("Стандарт", 3, 0), disabled);
+        await dbContext.SaveChangesAsync(CancellationToken.None);
+
+        var handler = new PnvPanel.Application.Plans.ListPlansQueryHandler(dbContext);
+        var result = await handler.Handle(new PnvPanel.Application.Plans.ListPlansQuery(), CancellationToken.None);
+
+        Assert.True(result.IsSuccess);
+        Assert.Single(result.Value);
+        Assert.Equal("Стандарт", result.Value[0].Name);
+    }
+}