chore(392): regenerate migration + OpenAPI + decisions catalog after rebase onto main

The rebase onto origin/main (which merged #74's ChannelGraphicsElement
migration) left the PadToNearestMinute migration's embedded Designer.cs
model snapshot stale — it still reflected the pre-#74 model, so EF's
diff against it produced an empty Up()/Down() when naively regenerated.
Reset TvContextModelSnapshot.cs to origin/main's true post-#74 state,
then re-ran scripts/add-migration.sh so the migration's Designer.cs
correctly folds in ChannelGraphicsElement and the migration's Up() adds
only the PadToNearestMinute column. Verified has-pending-model-changes
is clean for both providers.

OpenAPI (v1.json/v1.d.ts/endpoint-index.md) and docs/decisions/README.md
regenerated identically to the auto-merged state, so nothing to commit
there — confirmed both padToNearestMinute and #74's graphics-elements
endpoints/decision key are present.

Stripped a UTF-8 BOM this dotnet-ef/dotnet-format toolchain wrote into
the regenerated migration + snapshot files (known BOM trap, ersatztv#311).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

ErsatzTV.Infrastructure.MySql/Migrations/20260723061238_Add_ProgramSchedule_PadToNearestMinute.Designer.cs

@@ -12,7 +12,7 @@ using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
 namespace ErsatzTV.Infrastructure.MySql.Migrations
 {
     [DbContext(typeof(TvContext))]
-    [Migration("20260722194743_Add_ProgramSchedule_PadToNearestMinute")]
+    [Migration("20260723061238_Add_ProgramSchedule_PadToNearestMinute")]
     partial class Add_ProgramSchedule_PadToNearestMinute
     {
         /// <inheritdoc />
@@ -406,6 +406,21 @@ namespace ErsatzTV.Infrastructure.MySql.Migrations
                     b.ToTable("Channel", (string)null);
                 });
 
+            modelBuilder.Entity("ErsatzTV.Core.Domain.ChannelGraphicsElement", b =>
+                {
+                    b.Property<int>("ChannelId")
+                        .HasColumnType("int");
+
+                    b.Property<int>("GraphicsElementId")
+                        .HasColumnType("int");
+
+                    b.HasKey("ChannelId", "GraphicsElementId");
+
+                    b.HasIndex("GraphicsElementId");
+
+                    b.ToTable("ChannelGraphicsElement");
+                });
+
             modelBuilder.Entity("ErsatzTV.Core.Domain.ChannelTemplate", b =>
                 {
                     b.Property<int>("Id")
@@ -4739,6 +4754,25 @@ namespace ErsatzTV.Infrastructure.MySql.Migrations
                     b.Navigation("Watermark");
                 });
 
+            modelBuilder.Entity("ErsatzTV.Core.Domain.ChannelGraphicsElement", b =>
+                {
+                    b.HasOne("ErsatzTV.Core.Domain.Channel", "Channel")
+                        .WithMany("ChannelGraphicsElements")
+                        .HasForeignKey("ChannelId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.HasOne("ErsatzTV.Core.Domain.GraphicsElement", "GraphicsElement")
+                        .WithMany("ChannelGraphicsElements")
+                        .HasForeignKey("GraphicsElementId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("Channel");
+
+                    b.Navigation("GraphicsElement");
+                });
+
             modelBuilder.Entity("ErsatzTV.Core.Domain.ChannelTemplate", b =>
                 {
                     b.HasOne("ErsatzTV.Core.Domain.FFmpegProfile", "FFmpegProfile")
@@ -6784,6 +6818,8 @@ namespace ErsatzTV.Infrastructure.MySql.Migrations
                 {
                     b.Navigation("Artwork");
 
+                    b.Navigation("ChannelGraphicsElements");
+
                     b.Navigation("Playouts");
                 });
 
@@ -6830,6 +6866,8 @@ namespace ErsatzTV.Infrastructure.MySql.Migrations
                 {
                     b.Navigation("BlockItemGraphicsElements");
 
+                    b.Navigation("ChannelGraphicsElements");
+
                     b.Navigation("DecoGraphicsElements");
 
                     b.Navigation("PlayoutItemGraphicsElements");

ErsatzTV.Infrastructure.Sqlite/Migrations/20260723061139_Add_ProgramSchedule_PadToNearestMinute.Designer.cs

@@ -11,7 +11,7 @@ using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
 namespace ErsatzTV.Infrastructure.Sqlite.Migrations
 {
     [DbContext(typeof(TvContext))]
-    [Migration("20260722194624_Add_ProgramSchedule_PadToNearestMinute")]
+    [Migration("20260723061139_Add_ProgramSchedule_PadToNearestMinute")]
     partial class Add_ProgramSchedule_PadToNearestMinute
     {
         /// <inheritdoc />
@@ -393,6 +393,21 @@ namespace ErsatzTV.Infrastructure.Sqlite.Migrations
                     b.ToTable("Channel", (string)null);
                 });
 
+            modelBuilder.Entity("ErsatzTV.Core.Domain.ChannelGraphicsElement", b =>
+                {
+                    b.Property<int>("ChannelId")
+                        .HasColumnType("INTEGER");
+
+                    b.Property<int>("GraphicsElementId")
+                        .HasColumnType("INTEGER");
+
+                    b.HasKey("ChannelId", "GraphicsElementId");
+
+                    b.HasIndex("GraphicsElementId");
+
+                    b.ToTable("ChannelGraphicsElement");
+                });
+
             modelBuilder.Entity("ErsatzTV.Core.Domain.ChannelTemplate", b =>
                 {
                     b.Property<int>("Id")
@@ -4564,6 +4579,25 @@ namespace ErsatzTV.Infrastructure.Sqlite.Migrations
                     b.Navigation("Watermark");
                 });
 
+            modelBuilder.Entity("ErsatzTV.Core.Domain.ChannelGraphicsElement", b =>
+                {
+                    b.HasOne("ErsatzTV.Core.Domain.Channel", "Channel")
+                        .WithMany("ChannelGraphicsElements")
+                        .HasForeignKey("ChannelId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.HasOne("ErsatzTV.Core.Domain.GraphicsElement", "GraphicsElement")
+                        .WithMany("ChannelGraphicsElements")
+                        .HasForeignKey("GraphicsElementId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("Channel");
+
+                    b.Navigation("GraphicsElement");
+                });
+
             modelBuilder.Entity("ErsatzTV.Core.Domain.ChannelTemplate", b =>
                 {
                     b.HasOne("ErsatzTV.Core.Domain.FFmpegProfile", "FFmpegProfile")
@@ -6609,6 +6643,8 @@ namespace ErsatzTV.Infrastructure.Sqlite.Migrations
                 {
                     b.Navigation("Artwork");
 
+                    b.Navigation("ChannelGraphicsElements");
+
                     b.Navigation("Playouts");
                 });
 
@@ -6655,6 +6691,8 @@ namespace ErsatzTV.Infrastructure.Sqlite.Migrations
                 {
                     b.Navigation("BlockItemGraphicsElements");
 
+                    b.Navigation("ChannelGraphicsElements");
+
                     b.Navigation("DecoGraphicsElements");
 
                     b.Navigation("PlayoutItemGraphicsElements");