Fix Docker apply crash and add safe profile test flow

Remove invalid _mirror_manager from daemon.json that prevented Docker from starting. Add 2-minute test apply with auto-rollback, final apply confirmation, emergency-restore CLI/UI, and post-restart Docker health checks.

Co-authored-by: Cursor <cursoragent@cursor.com>

docker-compose.yml

@@ -19,6 +19,7 @@ services:
       - HOST_ROOT=/host
       - DATA_DIR=/app/data
       - ROLLBACK_MINUTES=${ROLLBACK_MINUTES:-15}
+      - TEST_ROLLBACK_MINUTES=${TEST_ROLLBACK_MINUTES:-2}
       - AUTO_TEST_INTERVAL_MINUTES=${AUTO_TEST_INTERVAL_MINUTES:-30}
     volumes:
       - /etc:/host/etc