docs: update infrastructure docs to reflect Celery/Redis implementation

- Update "Current State" table: Celery, Beat, Flower, Redis now production-ready
- Update "What We Need to Add": removed Celery/Redis, added S3 and Sentry as priorities
- Add Celery commands section to development environment
- Update services table with Redis, Celery, Flower ports
- Update Docker Compose services section with all Celery services
- Update Migration Path: Phase 1 & 2 marked as COMPLETE
- Update Next Steps: focus on S3, Sentry, CloudFlare
- Fix Celery app path in systemd services (app.core.celery_config)
- Add Flower systemd service configuration
- Add queue flags to Celery worker command

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

docs/deployment/production.md

@@ -81,7 +81,7 @@ StandardError=journal
 WantedBy=multi-user.target
 ```
 
-### Celery Worker (when implemented)
+### Celery Worker
 
 ```bash
 sudo nano /etc/systemd/system/wizamart-celery.service
@@ -98,7 +98,7 @@ Group=wizamart
 WorkingDirectory=/home/wizamart/app
 Environment="PATH=/home/wizamart/app/.venv/bin"
 EnvironmentFile=/home/wizamart/app/.env
-ExecStart=/home/wizamart/app/.venv/bin/celery -A app.celery worker --loglevel=info --concurrency=4
+ExecStart=/home/wizamart/app/.venv/bin/celery -A app.core.celery_config worker --loglevel=info -Q default,long_running,scheduled --concurrency=4
 Restart=always
 RestartSec=3
 StandardOutput=journal
@@ -125,7 +125,32 @@ Group=wizamart
 WorkingDirectory=/home/wizamart/app
 Environment="PATH=/home/wizamart/app/.venv/bin"
 EnvironmentFile=/home/wizamart/app/.env
-ExecStart=/home/wizamart/app/.venv/bin/celery -A app.celery beat --loglevel=info
+ExecStart=/home/wizamart/app/.venv/bin/celery -A app.core.celery_config beat --loglevel=info
+Restart=always
+RestartSec=3
+
+[Install]
+WantedBy=multi-user.target
+```
+
+### Flower (Task Monitoring)
+
+```bash
+sudo nano /etc/systemd/system/wizamart-flower.service
+```
+
+```ini
+[Unit]
+Description=Wizamart Flower Task Monitor
+After=network.target redis.service
+
+[Service]
+User=wizamart
+Group=wizamart
+WorkingDirectory=/home/wizamart/app
+Environment="PATH=/home/wizamart/app/.venv/bin"
+EnvironmentFile=/home/wizamart/app/.env
+ExecStart=/home/wizamart/app/.venv/bin/celery -A app.core.celery_config flower --port=5555
 Restart=always
 RestartSec=3
 
@@ -137,8 +162,8 @@ WantedBy=multi-user.target
 
 ```bash
 sudo systemctl daemon-reload
-sudo systemctl enable wizamart wizamart-celery wizamart-celery-beat
-sudo systemctl start wizamart wizamart-celery wizamart-celery-beat
+sudo systemctl enable wizamart wizamart-celery wizamart-celery-beat wizamart-flower
+sudo systemctl start wizamart wizamart-celery wizamart-celery-beat wizamart-flower
 ```
 
 ---