feat(shared): extend CreateSessionCommand with showcase metadata

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/GmRelay.Shared/Features/Sessions/CreateSession/CreateSessionCommand.cs

@@ -1,3 +1,4 @@
+using GmRelay.Shared.Domain;
 using GmRelay.Shared.Platform;
 
 namespace GmRelay.Shared.Features.Sessions.CreateSession;
@@ -9,4 +10,9 @@ public sealed record CreateSessionCommand(
     string Link,
     IReadOnlyList<DateTimeOffset> ScheduledTimes,
     int? MaxPlayers,
-    string? ImageReference);
+    string? ImageReference,
+    GameSystem? System = null,
+    string? Description = null,
+    string? Format = null,
+    int? DurationMinutes = null,
+    bool IsOneShot = false);

src/GmRelay.Shared/Features/Sessions/CreateSession/CreateSessionHandler.cs

@@ -117,8 +117,8 @@ public sealed class CreateSessionHandler(
             {
                 var sessionId = await connection.ExecuteScalarAsync<Guid>(
                     """
-                    INSERT INTO sessions (batch_id, group_id, title, join_link, scheduled_at, status, max_players)
-                    VALUES (@BatchId, @GroupId, @Title, @Link, @ScheduledAt, @Status, @MaxPlayers)
+                    INSERT INTO sessions (batch_id, group_id, title, join_link, scheduled_at, status, max_players, system, description, format, duration_minutes, is_one_shot)
+                    VALUES (@BatchId, @GroupId, @Title, @Link, @ScheduledAt, @Status, @MaxPlayers, @System, @Description, @Format, @DurationMinutes, @IsOneShot)
                     RETURNING id;
                     """,
                     new
@@ -129,7 +129,12 @@ public sealed class CreateSessionHandler(
                         Link = command.Link,
                         ScheduledAt = scheduledAt,
                         Status = SessionStatus.Planned,
-                        MaxPlayers = command.MaxPlayers
+                        MaxPlayers = command.MaxPlayers,
+                        System = command.System,
+                        command.Description,
+                        command.Format,
+                        DurationMinutes = command.DurationMinutes,
+                        IsOneShot = command.IsOneShot
                     },
                     transaction);