colaborative tích hợp redis để đồng bộ toàn bộ annotation

docker-compose.yml

@@ -18,6 +18,19 @@ services:
     networks:
       - lms_net
 
+  # ── Redis (temp annotation cache) ────────────────────────────────────────────
+  redis:
+    image: redis:7-alpine
+    restart: unless-stopped
+    command: redis-server --save "" --appendonly no  # in-memory only, no disk writes
+    healthcheck:
+      test: ["CMD", "redis-cli", "ping"]
+      interval: 5s
+      timeout: 3s
+      retries: 5
+    networks:
+      - lms_net
+
   # ── FastAPI backend ───────────────────────────────────────────────────────────
   backend:
     image: ${BACKEND_IMAGE:-lms-backend:latest}
@@ -28,12 +41,15 @@ services:
     depends_on:
       db:
         condition: service_healthy
+      redis:
+        condition: service_healthy
     environment:
       DATABASE_URL: postgresql+psycopg2://${POSTGRES_USER:-lms_user}:${POSTGRES_PASSWORD}@db:5432/${POSTGRES_DB:-lms_db}
       JWT_SECRET_KEY: ${JWT_SECRET_KEY}
       JWT_ALGORITHM: HS256
       ACCESS_TOKEN_EXPIRE_MINUTES: ${ACCESS_TOKEN_EXPIRE_MINUTES:-60}
       UPLOAD_DIR: /uploads
+      REDIS_URL: redis://redis:6379/0
     volumes:
       - pdf_uploads:/uploads
     expose: