Implement BumperEndpoints and remove deprecated bumper-related functionality

Added new BumperEndpoints to the API for managing bumper templates and variants, enhancing the channel management capabilities. Removed outdated bumper-related commands and handlers from the application, streamlining the codebase and improving maintainability. Updated ChannelEndpoints to reflect these changes and ensure proper routing for the new endpoints.

backend/tests/TeleWave.Integration.Tests/GridScheduleGeneratorIntegrationTests.cs

@@ -251,7 +251,7 @@ public sealed class GridScheduleGeneratorIntegrationTests(PostgresFixture fixtur
         var filler = ReadyAsset(db, $"filler-{suffix}.mkv", TimeSpan.FromMinutes(1));
 
         var channel = Channel.Create($"Канал {suffix}", $"ch-{suffix}", Now.AddDays(-7));
-        channel.UpdateSettings(channel.Name, isEnabled: true, bumpersEnabled: false, filler.Id);
+        channel.UpdateSettings(channel.Name, isEnabled: true, filler.Id);
 
         var template = ScheduleTemplate.Create(channel.Id, "Сетка");
         var layer = template.AddLayer("Базовый", 10);

backend/tests/TeleWave.Integration.Tests/TemplateOperationsIntegrationTests.cs

@@ -19,7 +19,7 @@ namespace TeleWave.Integration.Tests;
 public sealed class TemplateOperationsIntegrationTests(PostgresFixture fixture)
 {
     [SkippableFact]
-    public async Task Copy_MovesLayersSlotsAndJunctions_AndReplacesTargetGrid()
+    public async Task Copy_MovesLayersAndSlots_AndReplacesTargetGrid()
     {
         Skip.IfNot(fixture.Available, "Docker недоступен");
 
@@ -36,7 +36,6 @@ public sealed class TemplateOperationsIntegrationTests(PostgresFixture fixture)
 
         Assert.Equal(1, result.Value.Layers);
         Assert.Equal(1, result.Value.Slots);
-        Assert.Equal(1, result.Value.Junctions);
 
         await using var verify = fixture.CreateContext();
         var target = verify.Channels.Single(c => c.Id == targetId);
@@ -54,13 +53,15 @@ public sealed class TemplateOperationsIntegrationTests(PostgresFixture fixture)
         Assert.Equal(groupId, slot.GroupId);
         Assert.Single(verify.Groups.Where(g => g.Id == groupId));
 
-        // Стык переехал своей копией, и слот ссылается на неё, а не на стык чужого канала.
-        var junction = verify.JunctionTemplates.Single(j => j.ChannelId == targetId);
-        Assert.Equal(junction.Id, slot.JunctionAfterId);
-        Assert.NotEqual(
-            verify.JunctionTemplates.Single(j => j.ChannelId == sourceId).Id,
-            slot.JunctionAfterId
-        );
+        // Стыки общие — копия ссылается на тот же стык, а не заводит свой.
+        var sourceSlot = verify
+            .ScheduleTemplates.Include(t => t.Layers)
+                .ThenInclude(l => l.Slots)
+            .Single(t => t.ChannelId == sourceId)
+            .Layers.SelectMany(l => l.Slots)
+            .Single();
+        Assert.Equal(sourceSlot.JunctionAfterId, slot.JunctionAfterId);
+        Assert.NotNull(slot.JunctionAfterId);
     }
 
     [Fact]
@@ -148,9 +149,22 @@ public sealed class TemplateOperationsIntegrationTests(PostgresFixture fixture)
         var source = Channel.Create($"Источник {suffix}", $"src-{suffix}", DateTimeOffset.UtcNow);
         var target = Channel.Create($"Приёмник {suffix}", $"dst-{suffix}", DateTimeOffset.UtcNow);
 
-        var junction = JunctionTemplate.Create(source.Id, "Прайм");
+        var junction = JunctionTemplate.Create($"Прайм {suffix}");
         var ad = junction.AddElement(JunctionElementKind.Ad);
-        ad.Update(JunctionElementKind.Ad, group.Id, null, JunctionAmountMode.Count, 2, true, null);
+        ad.Update(
+            new JunctionElementSettings(
+                JunctionElementKind.Ad,
+                group.Id,
+                null,
+                null,
+                JunctionAmountMode.Count,
+                2,
+                true,
+                null,
+                JunctionElement.DefaultChoiceWeight,
+                null
+            )
+        );
         db.JunctionTemplates.Add(junction);
 
         var sourceTemplate = ScheduleTemplate.Create(source.Id, "Сетка источника");