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 Removed outdated bumper-related commands and handlers from the application, streamlining the codebase and improving maintainability.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.Domain.Tests/Broadcast/ChannelTests.cs

@@ -10,7 +10,7 @@ public class ChannelTests
     private static Channel NewChannel() => Channel.Create("News", "news", Epoch);
 
     [Fact]
-    public void Create_SetsDefaults_AndSeedsDefaultBumperTemplate()
+    public void Create_SetsDefaults()
     {
         var channel = NewChannel();
 
@@ -19,15 +19,8 @@ public class ChannelTests
         Assert.Equal("news", channel.Slug);
         Assert.True(channel.IsEnabled);
         Assert.Equal(Epoch, channel.EpochUtc);
-        Assert.False(channel.BumpersEnabled);
-        Assert.Equal(BumperSelection.WeightedRandom, channel.BumperSelection);
         Assert.Equal(Channel.DefaultUtcOffsetMinutes, channel.UtcOffsetMinutes);
         Assert.Equal(Channel.DefaultDayStartTime, channel.DayStartTime);
-
-        var template = Assert.Single(channel.BumperTemplates);
-        Assert.True(template.IsDefault);
-        Assert.Equal(0, template.Position);
-        Assert.Single(template.Variants); // дефолтный подблок
     }
 
     [Fact]
@@ -36,25 +29,13 @@ public class ChannelTests
         var channel = NewChannel();
         var filler = Guid.NewGuid();
 
-        channel.UpdateSettings("N2", false, true, filler);
+        channel.UpdateSettings("N2", false, filler);
 
         Assert.Equal("N2", channel.Name);
         Assert.False(channel.IsEnabled);
-        Assert.True(channel.BumpersEnabled);
         Assert.Equal(filler, channel.FillerAssetId);
     }
 
-    [Fact]
-    public void UpdateBumperSettings_ChangesFontAndSelection()
-    {
-        var channel = NewChannel();
-
-        channel.UpdateBumperSettings(BumperFont.Serif, BumperSelection.AlwaysFirst);
-
-        Assert.Equal(BumperFont.Serif, channel.BumperFont);
-        Assert.Equal(BumperSelection.AlwaysFirst, channel.BumperSelection);
-    }
-
     [Theory]
     [InlineData(-1.0, 2.0, 0.0, 1.0)]
     [InlineData(0.4, 0.25, 0.4, 0.25)]
@@ -88,35 +69,6 @@ public class ChannelTests
         Assert.Equal(0.0, channel.AnalogFilterStrength);
     }
 
-    [Fact]
-    public void AddBumperTemplate_AppendsWithNextPosition()
-    {
-        var channel = NewChannel();
-
-        var t1 = channel.AddBumperTemplate("Block 2");
-        var t2 = channel.AddBumperTemplate("Block 3");
-
-        Assert.Equal(1, t1.Position);
-        Assert.Equal(2, t2.Position);
-        Assert.False(t1.IsDefault);
-        Assert.Equal(3, channel.BumperTemplates.Count);
-        Assert.Equal(t1, channel.FindBumperTemplate(t1.Id));
-        Assert.Null(channel.FindBumperTemplate(Guid.NewGuid()));
-    }
-
-    [Fact]
-    public void RemoveBumperTemplate_CannotRemoveDefault_CanRemoveOthers()
-    {
-        var channel = NewChannel();
-        var def = channel.BumperTemplates[0];
-        var extra = channel.AddBumperTemplate("Block 2");
-
-        Assert.False(channel.RemoveBumperTemplate(def.Id));
-        Assert.True(channel.RemoveBumperTemplate(extra.Id));
-        Assert.False(channel.RemoveBumperTemplate(Guid.NewGuid()));
-        Assert.Single(channel.BumperTemplates);
-    }
-
     [Fact]
     public void UpdateTimeSettings_ClampsOffsetAndDropsNonPositiveNumber()
     {