chore(docker): temporarily run as root for legacy data migration

Keep the container running as root until existing /data database files owned by root are migrated, avoiding startup write-permission failures.

Dockerfile

@@ -13,5 +13,5 @@ VOLUME ["/data"]
 ENV DB="/data/fusion.db"
 HEALTHCHECK --interval=10s --timeout=3s --start-period=2s --retries=3 \
   CMD wget -q -O /dev/null http://127.0.0.1:8080/api/oidc/enabled || exit 1
-USER fusion:fusion
+# TODO: Temporarily run as root until legacy /data DB files owned by root are migrated.
 CMD [ "./fusion" ]