gaiad: drop hardcoded p2p port (auto-assign to avoid host collision w/ morph 26656)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

cosmos/gaiad/cosmos-mainnet-gaiad-pruned.yml

@@ -51,8 +51,8 @@ services:
       nofile: 1048576    # Max open files (for RPC/WS connections)
     user: root
     ports:
-      - 26656:26656
-      - 26656:26656/udp
+      - 12554:12554
+      - 12554:12554/udp
     expose:
       - 26657
       - 26660
@@ -64,7 +64,7 @@ services:
       - IP=${IP}
       - MIN_GAS=0.005uatom
       - MONIKER=d${DOMAIN:-local}
-      - P2P_PORT=26656
+      - P2P_PORT=12554
       - SEEDS=ade4d8bc8cbe014af6ebdf3cb7b1e9ad36f412c0@seeds.polkachu.com:14956
       - STATESYNC_RPC=https://cosmos-rpc.polkachu.com:443
     restart: unless-stopped