Add Redis-backed chat queue

ai_knowledge_base_v2/docker-compose.dev.yml

@@ -21,6 +21,20 @@ services:
       timeout: 5s
       retries: 20
 
+  redis:
+    image: redis:7-alpine
+    container_name: ai_kb_v2_redis
+    ports:
+      - "6380:6379"
+    command: ["redis-server", "--appendonly", "yes"]
+    volumes:
+      - ai_kb_v2_redis_data:/data
+    healthcheck:
+      test: ["CMD", "redis-cli", "ping"]
+      interval: 5s
+      timeout: 5s
+      retries: 20
+
   backend:
     build:
       context: ./apps/backend
@@ -29,6 +43,7 @@ services:
       APP_ENV: docker
       DEBUG: "true"
       DATABASE_URL: mysql+pymysql://ai_kb:ai_kb@mysql:3306/ai_knowledge_base_v2?charset=utf8mb4
+      REDIS_URL: redis://redis:6379/0
       JWT_SECRET_KEY: local-dev-secret-change-before-production
       MOCK_SMS_ENABLED: "true"
       MOCK_SMS_CODE: "123456"
@@ -44,6 +59,8 @@ services:
     depends_on:
       mysql:
         condition: service_healthy
+      redis:
+        condition: service_healthy
 
   user-client:
     build:
@@ -69,3 +86,4 @@ services:
 
 volumes:
   ai_kb_v2_mysql_data:
+  ai_kb_v2_redis_data: