Remove unnecessary Redis service from Docker setup

Redis was included but not actually used by the video processor.
Only PostgreSQL is needed for Procrastinate job queue functionality.

- Remove redis service from docker-compose.yml
- Remove Redis dependencies from app and demo services
- Update README to reflect simplified service architecture

README.md

@@ -336,7 +336,6 @@ docker-compose down -v
 
 **Services included:**
 - 🗄️ **PostgreSQL** - Database with Procrastinate job queue
-- 🔴 **Redis** - Caching and session storage
 - 🎬 **App** - Main video processor demo
 - ⚡ **Worker** - Background job processor
 - 🧪 **Test** - Automated testing environment

docker-compose.yml

@@ -25,18 +25,6 @@ services:
     networks:
       - video_net
 
-  # Redis for additional caching (optional)
-  redis:
-    image: redis:7-alpine
-    ports:
-      - "6379:6379"
-    healthcheck:
-      test: ["CMD", "redis-cli", "ping"]
-      interval: 10s
-      timeout: 5s
-      retries: 5
-    networks:
-      - video_net
 
   # Video Processor API service
   app:
@@ -47,7 +35,6 @@ services:
     environment:
       - DATABASE_URL=postgresql://video_user:video_password@postgres:5432/video_processor
       - PROCRASTINATE_DATABASE_URL=postgresql://video_user:video_password@postgres:5432/video_processor
-      - REDIS_URL=redis://redis:6379/0
       - PYTHONPATH=/app
     volumes:
       - .:/app
@@ -58,8 +45,6 @@ services:
     depends_on:
       postgres:
         condition: service_healthy
-      redis:
-        condition: service_healthy
     networks:
       - video_net
     command: ["python", "examples/docker_demo.py"]
@@ -139,8 +124,6 @@ services:
     depends_on:
       postgres:
         condition: service_healthy
-      redis:
-        condition: service_healthy
     networks:
       - video_net
     command: ["python", "examples/web_demo.py"]