fix: bind consensus discovery to published UDP port

[zakazaka95]

Summary

• configure the consensus UDP listen port as 9222 for both mainnet and Sepolia
• align the listener with the Docker 9222:9222/udp mapping and advertised UDP port
• avoid fresh nodes silently binding discovery to a different default port

Fixes #1177

Testing

• verified both network env files use UDP port 9222 consistently
• verified the compose configuration publishes UDP 9222
• git diff --check

Docker Compose runtime validation was not available in the local environment.

[cb-heimdall]

🟡 Heimdall Review Status

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Reviews	🟡 0/1	Denominator calculation Show calculation 1 if user is bot 0 1 if user is external 0 2 if repo is sensitive 0 From .codeflow.yml 1 Additional review requirements Show calculation Max 0 0 From CODEOWNERS 0 Global minimum 0 Max 1 1 1 if commit is unverified 0 Sum 1