chore: initial project setup with backend, frontend, and infrastructure

Add complete NexaPantry application structure including:
- Docker Compose configuration with PostgreSQL, Redis, FastAPI backend, worker, frontend and Caddy
- Environment configuration template with database, auth, and service settings
- GitHub Actions CI workflow for backend/frontend linting, testing, auditing and Docker builds
- AGPL-3.0 license and comprehensive README with setup, development, and security documentation
- Backend

backend/app/worker/main.py

@@ -0,0 +1,31 @@
+import logging
+import time
+
+from app.core.config import get_settings
+from app.db.session import SessionLocal
+from app.services.notifications import create_expiry_notifications
+
+logging.basicConfig(level=get_settings().log_level)
+logger = logging.getLogger("nexapantry.worker")
+
+
+def run_once() -> int:
+    with SessionLocal() as db:
+        return create_expiry_notifications(db)
+
+
+def main() -> None:
+    interval = get_settings().daily_worker_interval_seconds
+    logger.info("NexaPantry worker started")
+    while True:
+        try:
+            count = run_once()
+            logger.info("Created %s notification records", count)
+        except Exception:
+            logger.exception("Worker cycle failed")
+        time.sleep(interval)
+
+
+if __name__ == "__main__":
+    main()
+