fix(mock-amm): prevent mainnet initialization of test-only AMM

[akintewe]

Summary

• mock-amm is documented as test-only but had no runtime check preventing it from being initialized on the public Stellar network.
• MockAmm::initialize now compares env.ledger().network_id() against the known Stellar mainnet passphrase hash and rejects the call with Error::MainnetNotSupported if it matches, so any mainnet initialization attempt fails on-chain.
• scripts/deploy_mainnet.sh previously had a DEPLOY_AMM=true flag that would upload, deploy, and initialize mock-amm on mainnet. That path is now rejected up front in require_mainnet_inputs, and the associated dead deployment code has been removed from the script.

Test plan

• No test changes included per task instructions.

closes #24

[coderabbitai]

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