refactor(backend): separate notification service from scheduler (#10579)

## Summary
- Create dedicated notification service entry point
(backend.notification:main)
- Remove NotificationManager from scheduler service for better
separation of concerns
- Update docker-compose to run notification service on dedicated port
8007
- Configure all services to communicate with separate notification
service

This refactoring separates the notification service from the scheduler
service, allowing them to run as independent microservices instead of
two processes in the same pod.

## Changes Made
- **New notification service entry point**: Created
`backend/backend/notification.py` with dedicated main function
- **Updated pyproject.toml**: Added notification service entry point
registration
- **Modified scheduler service**: Removed NotificationManager from
`backend/backend/scheduler.py`
- **Docker Compose updates**: Added notification_server service on port
8007, updated NOTIFICATIONMANAGER_HOST references

## Test plan
- [x] Verify notification service starts correctly with new entry point
- [x] Confirm scheduler service runs without notification manager
- [x] Test docker-compose configuration with separate services
- [x] Validate service discovery between microservices
- [x] Run linting and type checking

🤖 Generated with [Claude Code](https://claude.ai/code)

autogpt_platform/docker-compose.platform.yml

@@ -73,8 +73,6 @@ services:
         condition: service_completed_successfully
       rabbitmq:
         condition: service_healthy
-      # scheduler_server:
-      #   condition: service_healthy
     environment:
       - SUPABASE_URL=http://kong:8000
       - SUPABASE_JWT_SECRET=your-super-secret-jwt-token-with-at-least-32-characters-long
@@ -92,7 +90,7 @@ services:
       - PYRO_HOST=0.0.0.0
       - SCHEDULER_HOST=scheduler_server
       - EXECUTIONMANAGER_HOST=executor
-      - NOTIFICATIONMANAGER_HOST=rest_server
+      - NOTIFICATIONMANAGER_HOST=notification_server
       - CLAMAV_SERVICE_HOST=clamav
       - NEXT_PUBLIC_FRONTEND_BASE_URL=http://localhost:3000
       - BACKEND_CORS_ALLOW_ORIGINS=["http://localhost:3000"]
@@ -100,7 +98,6 @@ services:
       - UNSUBSCRIBE_SECRET_KEY=HlP8ivStJjmbf6NKi78m_3FnOogut0t5ckzjsIqeaio= # DO NOT USE IN PRODUCTION!!
     ports:
       - "8006:8006"
-      - "8007:8007"
     networks:
       - app-network
 
@@ -143,7 +140,7 @@ services:
       - ENABLE_AUTH=true
       - PYRO_HOST=0.0.0.0
       - AGENTSERVER_HOST=rest_server
-      - NOTIFICATIONMANAGER_HOST=rest_server
+      - NOTIFICATIONMANAGER_HOST=notification_server
       - CLAMAV_SERVICE_HOST=clamav
       - ENCRYPTION_KEY=dvziYgz0KSK8FENhju0ZYi8-fRTfAdlz6YLhdB_jhNw= # DO NOT USE IN PRODUCTION!!
     ports:
@@ -167,8 +164,6 @@ services:
         condition: service_healthy
       redis:
         condition: service_healthy
-      # rabbitmq:
-      #   condition: service_healthy
       migrate:
         condition: service_completed_successfully
       database_manager:
@@ -257,7 +252,7 @@ services:
     #   retries: 5
     environment:
       - DATABASEMANAGER_HOST=database_manager
-      - NOTIFICATIONMANAGER_HOST=rest_server
+      - NOTIFICATIONMANAGER_HOST=notification_server
       - SUPABASE_JWT_SECRET=your-super-secret-jwt-token-with-at-least-32-characters-long
       - DATABASE_URL=postgresql://postgres:your-super-secret-and-long-postgres-password@db:5432/postgres?connect_timeout=60&schema=platform
       - DIRECT_URL=postgresql://postgres:your-super-secret-and-long-postgres-password@db:5432/postgres?connect_timeout=60&schema=platform
@@ -277,6 +272,44 @@ services:
     networks:
       - app-network
 
+  notification_server:
+    build:
+      context: ../
+      dockerfile: autogpt_platform/backend/Dockerfile
+      target: server
+    command: ["python", "-m", "backend.notification"]
+    develop:
+      watch:
+        - path: ./
+          target: autogpt_platform/backend/
+          action: rebuild
+    depends_on:
+      db:
+        condition: service_healthy
+      rabbitmq:
+        condition: service_healthy
+      migrate:
+        condition: service_completed_successfully
+      database_manager:
+        condition: service_started
+    environment:
+      - DATABASEMANAGER_HOST=database_manager
+      - REDIS_HOST=redis
+      - REDIS_PORT=6379
+      - REDIS_PASSWORD=password
+      - RABBITMQ_HOST=rabbitmq
+      - RABBITMQ_PORT=5672
+      - RABBITMQ_DEFAULT_USER=rabbitmq_user_default
+      - RABBITMQ_DEFAULT_PASS=k0VMxyIJF9S35f3x2uaw5IWAl6Y536O7
+      - ENABLE_AUTH=true
+      - PYRO_HOST=0.0.0.0
+      - BACKEND_CORS_ALLOW_ORIGINS=["http://localhost:3000"]
+
+    ports:
+      - "8007:8007"
+    networks:
+      - app-network
+
 #  frontend:
 #    build:
 #      context: ../