[borodino] fix(wg-gateway): use tasks.<service> DNS to resolve real container IP

Commit cfdb213

Description

route-setup.sh: resolve tasks.$WG_GW_HOST instead of $WG_GW_HOST to get the real task IP instead of Swarm VIP (10.0.6.4). Also switch wg-gateway endpoint_mode to dnsrr.

Note: routing still blocked at overlay VXLAN level - wg-gateway architecture needs redesign as host-network container.

Co-Authored-By: Claude Sonnet 4.6 noreply@anthropic.com

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