drpc: mount ./dshackle_logs:/logs for the dshackle accessLog

Gateway request-splits pilot (earnings misattribution fix): the accessLog
stub in main_configs pointed at /logs which was never mounted. Host-side
dir lets the splits tailer aggregate per-caller response counts.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

drpc.yml

@@ -4,6 +4,10 @@ services:
     restart: unless-stopped
     volumes:
       - ./main_configs:/etc/dshackle
+      # dshackle accessLog target (main_configs/dshackle.yaml accessLog.filename=/logs/...).
+      # Host-side dir so the splits tailer can aggregate gateway->region request shares
+      # (earnings misattribution fix, operator + claude-machine design 2026-07-09).
+      - ./dshackle_logs:/logs
     expose:
       - 8080
       - 8081