Use crypto randomness for deploy salts

[kongwen686]

Summary

• replace ContractDeployer.randomSalt() Math.random byte generation with crypto.randomBytes(32)
• add an edge test that verifies generated salts are 32 bytes, differ across calls, and do not consume or derive from mocked Math.random

Closes #254

Tests

• Not run locally; this environment could not obtain a full checkout reliably, so the patch was created and verified via GitHub API diff inspection.

Payment / contact

• Email: chaoqiang.tian@gmail.com
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Run ID: e80a92b1-93c7-403b-b77a-3352acd82aa5

📥 Commits

Reviewing files that changed from the base of the PR and between f2c023e and 6b1755e.

📒 Files selected for processing (2)

• packages/sdk/src/__tests__/ContractDeployer.edge.test.ts
• packages/sdk/src/deployer/ContractDeployer.ts

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🧪 Generate unit tests (beta)

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[kongwen686]

Payment update for this and my other open PR in this repository: Stripe onboarding is not available for me from mainland China. If the contributions are approved for rewards, can payout be sent via PayPal instead? PayPal receiving account: hooqee@126.com. Contact email: chaoqiang.tian@gmail.com. If PayPal is not supported, Stellar/EVM/Alipay details are available on request / in PR bodies.