fix: reject ALLOW_INSECURE_RPC on mainnet (H9)

[0x-SquidSol]

Summary

• ALLOW_INSECURE_RPC=true bypassed all RPC URL scheme validation, including on mainnet
• A misconfigured deploy could send signed transactions with real funds over plaintext HTTP
• Now throws at startup when ALLOW_INSECURE_RPC=true and NETWORK=mainnet

Test plan

• throws when ALLOW_INSECURE_RPC=true and NETWORK=mainnet
• does not throw when ALLOW_INSECURE_RPC=true on devnet
• All 135 tests pass

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 50a9b223-2d3d-4945-b8b1-f68e47ca2068

📥 Commits

Reviewing files that changed from the base of the PR and between 3280971 and 6957650.

📒 Files selected for processing (2)

• src/env-guards.ts
• tests/env-guards.test.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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