feat: add resumable stream support for agent chat (#19107)

## Overview
Add resumable stream support for agent chat to allow clients to
reconnect and resume streaming responses if the connection is
interrupted (e.g., during page refresh).

## Changes

### Backend (Twenty Server)
- Add `activeStreamId` column to `AgentChatThreadEntity` to track
ongoing streams
- Create `AgentChatResumableStreamService` to manage Redis-backed
resumable streams using the `resumable-stream` library with ioredis
- Extend `AgentChatController` with:
  - `GET /:threadId/stream` endpoint to resume an existing stream
  - `DELETE /:threadId/stream` endpoint to stop an active stream
- Update `AgentChatStreamingService` to store streams in Redis and track
active stream IDs
- Add `resumable-stream@^2.2.12` dependency to package.json

### Frontend (Twenty Front)
- Update `useAgentChat` hook to:
- Use a persistent transport with `prepareReconnectToStreamRequest` for
resumable streams
  - Export `resumeStream` function from useChat
  - Add `handleStop` callback to clear active stream on DELETE endpoint
- Use thread ID as stable message ID instead of including message count
- Add stream resumption logic in `AgentChatAiSdkStreamEffect` component
to automatically call `resumeStream()` when switching threads

## Database Migration
New migration `1774003611071-add-active-stream-id-to-agent-chat-thread`
adds the `activeStreamId` column to store the current resumable stream
identifier.

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

packages/twenty-server/src/engine/core-modules/message-queue/jobs.module.ts

@@ -20,6 +20,7 @@ import { HandleWorkspaceMemberDeletedJob } from 'src/engine/core-modules/workspa
 import { WorkspaceEntity } from 'src/engine/core-modules/workspace/workspace.entity';
 import { WorkspaceModule } from 'src/engine/core-modules/workspace/workspace.module';
 import { AiAgentMonitorModule } from 'src/engine/metadata-modules/ai/ai-agent-monitor/ai-agent-monitor.module';
+import { AiChatModule } from 'src/engine/metadata-modules/ai/ai-chat/ai-chat.module';
 import { DataSourceModule } from 'src/engine/metadata-modules/data-source/data-source.module';
 import { LogicFunctionModule } from 'src/engine/metadata-modules/logic-function/logic-function.module';
 import { NavigationMenuItemModule } from 'src/engine/metadata-modules/navigation-menu-item/navigation-menu-item.module';
@@ -67,6 +68,7 @@ import { WorkflowModule } from 'src/modules/workflow/workflow.module';
     SubscriptionsModule,
     AuditJobModule,
     AiAgentMonitorModule,
+    AiChatModule,
     LogicFunctionModule,
     EnterpriseModule,
   ],

packages/twenty-server/src/engine/core-modules/message-queue/message-queue-priority.constant.ts

@@ -17,4 +17,5 @@ export const MESSAGE_QUEUE_PRIORITY = {
   [MessageQueue.deleteCascadeQueue]: 6,
   [MessageQueue.cronQueue]: 7,
   [MessageQueue.aiQueue]: 5,
+  [MessageQueue.aiStreamQueue]: 2,
 };

packages/twenty-server/src/engine/core-modules/message-queue/message-queue-worker-options.constant.ts

@@ -0,0 +1,7 @@
+import { MessageQueue } from 'src/engine/core-modules/message-queue/message-queue.constants';
+
+export const QUEUE_WORKER_OPTIONS: Partial<
+  Record<MessageQueue, { concurrency: number }>
+> = {
+  [MessageQueue.aiStreamQueue]: { concurrency: 20 },
+};

packages/twenty-server/src/engine/core-modules/message-queue/message-queue.constants.ts

@@ -19,4 +19,5 @@ export enum MessageQueue {
   logicFunctionQueue = 'logic-function-queue',
   triggerQueue = 'trigger-queue',
   aiQueue = 'ai-queue',
+  aiStreamQueue = 'ai-stream-queue',
 }

packages/twenty-server/src/engine/core-modules/message-queue/message-queue.explorer.ts

@@ -18,6 +18,8 @@ import { type MessageQueueWorkerOptions } from 'src/engine/core-modules/message-
 import { ExceptionHandlerService } from 'src/engine/core-modules/exception-handler/exception-handler.service';
 import { MessageQueueMetadataAccessor } from 'src/engine/core-modules/message-queue/message-queue-metadata.accessor';
 import { type MessageQueueService } from 'src/engine/core-modules/message-queue/services/message-queue.service';
+import { type MessageQueue } from 'src/engine/core-modules/message-queue/message-queue.constants';
+import { QUEUE_WORKER_OPTIONS } from 'src/engine/core-modules/message-queue/message-queue-worker-options.constant';
 import { getQueueToken } from 'src/engine/core-modules/message-queue/utils/get-queue-token.util';
 import { shouldCaptureException } from 'src/engine/utils/global-exception-handler.util';
 
@@ -67,6 +69,7 @@ export class MessageQueueExplorer implements OnModuleInit {
       this.handleProcessorGroupCollection(
         processorGroupCollection,
         messageQueueService,
+        QUEUE_WORKER_OPTIONS[queueName as MessageQueue],
       );
     }
   }