fix: resolve port collisions for polygon-amoy and zircuit-garfield

- polygon-amoy: reassigned from port 12188 (collision with hashkeychain-mainnet)
  to 12190 via salt+2 in generate_ports()
- zircuit-garfield/testnet: fix empty --networkid= (was {{ chain_id }},
  now {{ chainid }})

Co-Authored-By: Claude Agent <claude@stakesquid.eu>

op/geth/zircuit-testnet-op-geth-pruned-pebble-path.yml

@@ -67,7 +67,7 @@ services:
       - --metrics.addr=0.0.0.0
       - --metrics.port=6060
       - --nat=extip:${IP}
-      - --networkid=
+      - --networkid=48899
       - --port=12804
       - --rpc.gascap=600000000
       - --rpc.txfeecap=0