Added PostgreSQL RDS database. Added channels protected endpoints. Added scripts and docker config to run application locally in dev mode.

scripts/stop_local_dev.sh

@@ -0,0 +1,19 @@
+#!/bin/bash
+
+# Stop FastAPI
+if [ -f iptv-updater.pid ]; then
+    kill $(cat iptv-updater.pid)
+    rm iptv-updater.pid
+    echo "Stopped FastAPI"
+fi
+
+# Clean up mock auth and database environment variables
+unset MOCK_AUTH
+unset DB_USER
+unset DB_PASSWORD
+unset DB_HOST
+unset DB_NAME
+
+# Stop PostgreSQL
+docker-compose -f docker/docker-compose-db.yml down
+echo "Stopped PostgreSQL"