chore(cli): unify numeric CLI option parsing

[danytrackmania]

This PR replaces manual numeric parsing in CLI flags with numberConfigHelper and optionalNumberConfigHelper:

• Replaces parseInt(...) for --port, --admin-port with numberConfigHelper
• Replaces parseInt(...) for deployAztecContractsSalt with optionalNumberConfigHelper
• Adds missing imports from @aztec/foundation/config

This makes CLI option parsing consistent with the rest of the codebase and aligns with existing patterns used in bot, p2p, and prover config mappings.