feat(deployment): migrate to external Redis stack

Architecture Changes:
- Remove embedded Redis service from production configuration
- Remove port 80/443 direct bindings (Traefik handles routing)
- Update queue-worker and scheduler dependencies (Redis now external)
- Completes Redis stack migration following PostgreSQL pattern
- Resolves port conflict with Traefik reverse proxy

Related Files:
- deployment/stacks/redis/docker-compose.yml (Redis stack - already deployed)
- docker-compose.redis-override.yml (application integration - already created)

Migration Benefits:
- Architectural consistency with PostgreSQL stack pattern
- Better separation of concerns (infrastructure vs application)
- Independent Redis lifecycle management
- Shared Redis instance via app-internal network
- Eliminated port 80 binding conflict

Deployment Command:
docker compose -f docker-compose.base.yml -f docker-compose.production.yml \
  -f docker-compose.postgres-override.yml -f docker-compose.redis-override.yml up -d

docker-compose.production.yml

@@ -19,10 +19,8 @@ services:
     # Production restart policy
     restart: always
 
-    # Production port mappings for Let's Encrypt
-    ports:
-      - "80:80"      # HTTP for ACME challenge
-      - "443:443"    # HTTPS for production traffic
+    # Note: Port mappings removed - Traefik handles all external routing
+    # No direct port bindings needed, Traefik proxies traffic to this container
 
     # Override volumes - use Let's Encrypt certificates and mount application code
     volumes:
@@ -152,82 +150,8 @@ services:
   # Database service removed - using external PostgreSQL Stack (deployment/stacks/postgresql/)
   # Connection via app-internal network using docker-compose.postgres-override.yml
 
-  redis:
-    # Production restart policy
-    restart: always
-
-    # Use Docker Secrets for Redis password
-    environment:
-      REDIS_PASSWORD_FILE: /run/secrets/redis_password
-    secrets:
-      - redis_password
-
-    # Security hardening
-    security_opt:
-      - no-new-privileges:true
-    # Don't set user here - we need root to read Docker Secrets in entrypoint
-    # Redis will run as root, but this is acceptable for this use case
-    cap_drop:
-      - ALL
-    cap_add:
-      - CHOWN        # Required for creating appendonlydir with correct permissions
-      - DAC_OVERRIDE # Required for writing to /data volume owned by redis user
-
-    # Use entrypoint script to inject password from Docker Secret into environment
-    # This makes password available to both Redis startup AND health check
-    # Note: Script runs as root to read Docker Secrets, then starts Redis
-    entrypoint: ["/bin/sh", "-c"]
-    command:
-      - |
-        # Read password from Docker Secret (as root) and export for health check
-        export REDIS_PASSWORD=$(cat /run/secrets/redis_password 2>/dev/null || echo '')
-        # Start Redis with all settings as command line arguments (no config file to avoid conflicts)
-        if [ -n "$REDIS_PASSWORD" ]; then
-          exec redis-server \
-            --bind 0.0.0.0 \
-            --dir /data \
-            --save 900 1 \
-            --save 300 10 \
-            --save 60 10000 \
-            --appendonly yes \
-            --requirepass "$REDIS_PASSWORD"
-        else
-          exec redis-server \
-            --bind 0.0.0.0 \
-            --dir /data \
-            --save 900 1 \
-            --save 300 10 \
-            --save 60 10000 \
-            --appendonly yes
-        fi
-
-    # Production resource limits
-    deploy:
-      resources:
-        limits:
-          memory: 512M
-          cpus: '1.0'
-        reservations:
-          memory: 256M
-          cpus: '0.5'
-
-    # Stricter health checks
-    # Health check reads password directly from Docker Secret
-    healthcheck:
-      test: ["CMD-SHELL", "redis-cli -a \"$(cat /run/secrets/redis_password 2>/dev/null || echo '')\" ping | grep -q PONG"]
-      interval: 10s
-      timeout: 3s
-      retries: 5
-      start_period: 30s
-
-    # JSON logging
-    logging:
-      driver: json-file
-      options:
-        max-size: "10m"
-        max-file: "5"
-        compress: "true"
-        labels: "service,environment"
+  # Redis service removed - using external Redis Stack (deployment/stacks/redis/)
+  # Connection via app-internal network using docker-compose.redis-override.yml
 
   queue-worker:
     # Use pre-built image from registry (override build from base)
@@ -292,11 +216,9 @@ services:
 
     # Wait for dependencies to be healthy before starting
     depends_on:
-      redis:
-        condition: service_healthy
       php:
         condition: service_healthy
-      # Note: PostgreSQL (postgres) is external service, connection via app-internal network
+      # Note: PostgreSQL and Redis are external services, connection via app-internal network
 
   # Scheduler (Cron Jobs)
   scheduler:
@@ -366,11 +288,9 @@ services:
 
     # Wait for dependencies to be healthy before starting
     depends_on:
-      redis:
-        condition: service_healthy
       php:
         condition: service_healthy
-      # Note: PostgreSQL (postgres) is external service, connection via app-internal network
+      # Note: PostgreSQL and Redis are external services, connection via app-internal network
 
   # Certbot Sidecar Container for Let's Encrypt
   certbot: