chore: production docker + compose for LAN deployment

wsgi.py

@@ -0,0 +1,39 @@
+"""WSGI entrypoint for production deployments.
+
+This module is what Gunicorn imports.
+We also start background tasks that are normally started in run.py:
+- UDP trigger listener
+- event expiry monitor
+"""
+
+from __future__ import annotations
+
+import os
+
+from app import create_app
+from models import db
+from sockets import start_event_monitor
+from udp_listener import start_udp_listener
+
+
+app = create_app()
+
+# Ensure DB exists on first boot (SQLite-based default).
+with app.app_context():
+    db.create_all()
+
+
+def _start_background_tasks() -> None:
+    start_udp_listener(app)
+    start_event_monitor(app)
+
+
+# With Gunicorn the module can be imported multiple times (worker processes).
+# This app is designed for LAN/kiosk setups; we intentionally run a single worker
+# by default to avoid duplicated UDP listeners.
+if os.environ.get("SYNCPLAYER_START_TASKS", "1") in ("1", "true", "yes"):
+    _start_background_tasks()
+
+
+# Note: create_app() calls socketio.init_app(app), which wraps app.wsgi_app.
+# For Gunicorn, we can export the Flask app directly.