feat: add Easypanel deployment config

- Dockerfile.app: single container with supervisord (API + Worker + Beat + Scanner)
- supervisord.conf: process manager for 4 services in one container
- EASYPANEL.md: step-by-step deploy guide for Easypanel
- EASYPANEL-README.md: repo structure and deploy flow overview

supervisord.conf

@@ -0,0 +1,58 @@
+[supervisord]
+nodaemon=true
+logfile=/var/log/supervisor/supervisord.log
+pidfile=/var/run/supervisord.pid
+user=root
+
+[program:api]
+command=sh -c "uvicorn src.main:app --host 0.0.0.0 --port 8000 --workers ${API_WORKERS:-4} --access-log --proxy-headers --forwarded-allow-ips '*'"
+directory=/app
+autostart=true
+autorestart=true
+stdout_logfile=/dev/stdout
+stdout_logfile_maxbytes=0
+stderr_logfile=/dev/stderr
+stderr_logfile_maxbytes=0
+stopwaitsecs=10
+killasgroup=true
+priority=100
+
+[program:worker]
+command=celery -A src.celery_app worker --loglevel=info --concurrency=2
+directory=/app
+autostart=true
+autorestart=true
+stdout_logfile=/dev/stdout
+stdout_logfile_maxbytes=0
+stderr_logfile=/dev/stderr
+stderr_logfile_maxbytes=0
+stopwaitsecs=30
+killasgroup=true
+priority=200
+
+[program:beat]
+command=celery -A src.celery_app beat --loglevel=info
+directory=/app
+autostart=true
+autorestart=true
+stdout_logfile=/dev/stdout
+stdout_logfile_maxbytes=0
+stderr_logfile=/dev/stderr
+stderr_logfile_maxbytes=0
+stopwaitsecs=10
+killasgroup=true
+priority=300
+
+[program:scanner]
+command=python -m src.worker
+directory=/app
+autostart=${ENABLE_SCANNER:-false}
+autorestart=true
+stdout_logfile=/dev/stdout
+stdout_logfile_maxbytes=0
+stderr_logfile=/dev/stderr
+stderr_logfile_maxbytes=0
+stopwaitsecs=10
+killasgroup=true
+priority=400
+environment=PYTHONUNBUFFERED="1"