scripts/deploy.mjs hardcodes the testnet RPC URL and network passphrase

[chonilius]

scripts/deploy.mjs defines const RPC_URL = "https://soroban-testnet.stellar.org" and const NETWORK_PASSPHRASE = Networks.TESTNET as hardcoded constants, with no CLI flag or environment variable to target a different network. The Makefile's own deploy targets support a NETWORK variable for the stellar CLI (make deploy-escrow NETWORK=testnet), but this Node fallback script — which the README documents as the actually-used path for the current testnet deployment, since stellar-cli's HTTP client couldn't reach the RPC endpoint from that environment — has no equivalent, meaning it can't be used at all for a future mainnet or futurenet deployment without editing the script's source.

[Wiseman52]

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[tonyy-starrk]

@tonyy-starrk has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

hello miantainer, i would like to work on this

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