fix(devops): set Valkey maxmemory-policy to noeviction for BullMQ

BullMQ requires noeviction to prevent silent job data loss. With
allkeys-lru, Valkey could evict keys BullMQ depends on for job tracking.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

docker-compose.prod.yml

@@ -50,7 +50,7 @@ services:
     command:
       - valkey-server
       - --maxmemory ${VALKEY_MAXMEMORY:-256mb}
-      - --maxmemory-policy allkeys-lru
+      - --maxmemory-policy noeviction
       - --appendonly yes
     volumes:
       - valkey_data:/data