Migrate Show.Date from DateOnly to DateTime to support time of day

Removes DateOnly/DateTime conversion boilerplate from all Show endpoints
and adds the corresponding EF Core migration.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

PyroFetes/Migrations/PyroFetesDbContextModelSnapshot.cs

@@ -816,8 +816,8 @@ namespace PyroFetes.Migrations
                     b.Property<int?>("CityId")
                         .HasColumnType("int");
 
-                    b.Property<DateOnly?>("Date")
-                        .HasColumnType("date");
+                    b.Property<DateTime?>("Date")
+                        .HasColumnType("datetime2");
 
                     b.Property<string>("Description")
                         .HasMaxLength(500)
@@ -887,7 +887,7 @@ namespace PyroFetes.Migrations
 
                     b.HasIndex("TruckId");
 
-                    b.ToTable("ShowTruck");
+                    b.ToTable("ShowTrucks");
                 });
 
             modelBuilder.Entity("PyroFetes.Models.Sound", b =>
@@ -1593,8 +1593,7 @@ namespace PyroFetes.Migrations
                 {
                     b.HasOne("PyroFetes.Models.City", "City")
                         .WithMany("Shows")
-                        .HasForeignKey("CityId")
-                        .OnDelete(DeleteBehavior.ClientSetNull);
+                        .HasForeignKey("CityId");
 
                     b.Navigation("City");
                 });