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 Removed outdated bumper-related commands and handlers from the application, streamlining the codebase and improving maintainability.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/BumperTextVariantTests.cs

@@ -6,21 +6,17 @@ namespace TeleWave.Domain.Tests.Broadcast;
 public class BumperTextVariantTests
 {
     private static BumperTextVariant NewVariant() =>
-        Channel
-            .Create("c", "c", DateTimeOffset.UnixEpoch)
-            .AddBumperTemplate("b")
-            .AddVariant("Text");
+        BumperTemplate.Create("b", "Текст 1").AddVariant("Text");
 
     [Fact]
-    public void Create_HasDefaultLabelsAndWeight()
+    public void Create_HasDefaults()
     {
         var v = NewVariant();
 
-        Assert.Equal(BumperTextKind.NowNext, v.Kind);
-        Assert.Equal(BumperTextVariant.DefaultNowLabel, v.NowLabel);
-        Assert.Equal(BumperTextVariant.DefaultNextLabel, v.NextLabel);
         Assert.Equal(BumperTextVariant.DefaultWeight, v.Weight);
-        Assert.Equal(string.Empty, v.Line1);
+        Assert.Equal(BumperTrigger.OnShowChange, v.Trigger);
+        Assert.Equal(BumperBackground.NextPoster, v.Background);
+        Assert.Empty(v.Lines);
     }
 
     [Fact]
@@ -28,21 +24,31 @@ public class BumperTextVariantTests
     {
         var v = NewVariant();
 
-        v.Update(
-            "Name",
-            new BumperTextContent(BumperTextKind.Free, "NOW", "NEXT", "l1", "l2"),
-            BumperTrigger.Both,
-            -5
-        );
+        v.Update("Name", BumperTrigger.Both, BumperBackground.Template, -5);
 
         Assert.Equal("Name", v.Name);
-        Assert.Equal(BumperTextKind.Free, v.Kind);
-        Assert.Equal("NOW", v.NowLabel);
-        Assert.Equal("l1", v.Line1);
         Assert.Equal(BumperTrigger.Both, v.Trigger);
+        Assert.Equal(BumperBackground.Template, v.Background);
         Assert.Equal(0, v.Weight);
     }
 
+    [Fact]
+    public void SetLines_ReplacesAndRenumbers()
+    {
+        var v = NewVariant();
+
+        v.SetLines([
+            BumperLine.Create(7, BumperLineStyle.Label, BumperLineColor.Accent, " ДАЛЕЕ "),
+            BumperLine.Create(9, BumperLineStyle.Title, BumperLineColor.Text, "{next.title}"),
+        ]);
+
+        Assert.Equal([0, 1], v.Lines.Select(l => l.Position));
+        Assert.Equal("ДАЛЕЕ", v.Lines[0].Text);
+
+        v.SetLines([BumperLine.Create(0, BumperLineStyle.Title, BumperLineColor.Text, "один")]);
+        Assert.Single(v.Lines);
+    }
+
     [Theory]
     [InlineData(BumperTrigger.OnShowChange, true, true)]
     [InlineData(BumperTrigger.OnShowChange, false, false)]
@@ -53,7 +59,7 @@ public class BumperTextVariantTests
     public void Matches_FollowsTrigger(BumperTrigger trigger, bool isShowChange, bool expected)
     {
         var v = NewVariant();
-        v.Update("n", new BumperTextContent(BumperTextKind.NowNext, "a", "b", "", ""), trigger, 1);
+        v.Update("n", trigger, BumperBackground.Template, 1);
 
         Assert.Equal(expected, v.Matches(isShowChange));
     }