fix: align op-node RPC listener with Docker port mapping

[Lesnak1]

Summary

• make the op-node RPC listener use the Compose target port, 9545
• preserve the externally published host endpoint on port 7545
• keep the change limited to the incorrect command-line override

Problem

The rise-node service publishes 7545:9545, so Docker forwards host port 7545 to port 9545 inside the container. However, the service command overrides op-node with --rpc.port=7545.

That leaves Docker forwarding requests to container port 9545 while op-node listens on 7545, making the published rollup RPC endpoint unreachable.

Fix

Set --rpc.port=9545 so the in-container listener matches the Compose target port. The user-facing host port remains 7545.

Verification

• confirmed the branch is based on the current upstream main commit
• confirmed the remote comparison is one commit and one file with +1/-1
• configuration wiring check: host 7545 → container 9545; op-node listener 9545
• git diff --check