feat: add web batch bulk operations

src/GmRelay.Web/Services/AuthorizedSessionService.cs

@@ -26,6 +26,17 @@ public sealed class AuthorizedSessionService(ISessionStore sessionStore)
         return await GroupBelongsToGmAsync(session.GroupId, gmId) ? session : null;
     }
 
+    public async Task<WebSessionBatch?> GetBatchForGmAsync(Guid batchId, long gmId)
+    {
+        var batch = await sessionStore.GetBatchAsync(batchId);
+        if (batch is null)
+        {
+            return null;
+        }
+
+        return await GroupBelongsToGmAsync(batch.GroupId, gmId) ? batch : null;
+    }
+
     public async Task UpdateSessionForGmAsync(Guid sessionId, long gmId, string title, DateTime scheduledAt, string joinLink, int? maxPlayers)
     {
         var session = await GetSessionForGmAsync(sessionId, gmId);
@@ -48,6 +59,44 @@ public sealed class AuthorizedSessionService(ISessionStore sessionStore)
         await sessionStore.PromoteWaitlistedPlayerAsync(sessionId, session.GroupId);
     }
 
+    public async Task UpdateBatchDetailsForGmAsync(Guid batchId, long gmId, string title, string joinLink)
+    {
+        var batch = await GetBatchForGmAsync(batchId, gmId);
+        if (batch is null)
+        {
+            throw new SessionAccessDeniedException(batchId, gmId);
+        }
+
+        await sessionStore.UpdateBatchDetailsAsync(batchId, batch.GroupId, title.Trim(), joinLink.Trim());
+    }
+
+    public async Task RescheduleBatchForGmAsync(Guid batchId, long gmId, DateTime firstScheduledAt, int intervalDays)
+    {
+        if (intervalDays <= 0)
+        {
+            throw new ArgumentOutOfRangeException(nameof(intervalDays), intervalDays, "Interval must be greater than zero.");
+        }
+
+        var batch = await GetBatchForGmAsync(batchId, gmId);
+        if (batch is null)
+        {
+            throw new SessionAccessDeniedException(batchId, gmId);
+        }
+
+        await sessionStore.RescheduleBatchAsync(batchId, batch.GroupId, firstScheduledAt, intervalDays);
+    }
+
+    public async Task<WebSessionBatch> CloneBatchForGmAsync(Guid batchId, long gmId, BatchCloneInterval interval)
+    {
+        var batch = await GetBatchForGmAsync(batchId, gmId);
+        if (batch is null)
+        {
+            throw new SessionAccessDeniedException(batchId, gmId);
+        }
+
+        return await sessionStore.CloneBatchAsync(batchId, batch.GroupId, interval);
+    }
+
     private async Task<bool> GroupBelongsToGmAsync(Guid groupId, long gmId)
     {
         var group = await sessionStore.GetGroupAsync(groupId);