feat: implement Redis Streams support with stream checkpoints and update history

- Added Redis Streams operations to the message bus interface and implementation.
- Introduced StreamCheckpoint model to track last processed stream entry per document.
- Implemented UpsertStreamCheckpoint and GetStreamCheckpoint methods in the Postgres store.
- Created document_update_history table for storing update payloads for recovery and replay.
- Developed update persist worker to handle Redis Stream updates and persist them to Postgres.
- Enhanced Docker Compose configuration for Redis with persistence.
- Updated frontend API to support fetching document state with optional share token.
- Added connection stability monitoring in the Yjs document hook.

docker-compose.yml

@@ -24,8 +24,11 @@ services:
   redis:
     image: redis:7-alpine
     container_name: realtime-collab-redis
+    command: ["redis-server", "--appendonly", "yes"]
     ports:
       - "6379:6379"
+    volumes:
+      - redis_data:/data
     healthcheck:
       test: ["CMD", "redis-cli", "ping"]
       interval: 10s
@@ -34,3 +37,4 @@ services:
 
 volumes:
   postgres_data:
+  redis_data: