[Jossy-ossy]

Summary

• Centralize runtime environment access in the Zod-backed config module and validate numeric, boolean, network, and production-required settings.
• Replace direct environment reads across service modules with typed config accessors.
• Document per-network overrides and add validation regression coverage.

Closes #338

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[Jossy-ossy]

@Miracle656 I resolved the merge conflicts and updated this branch. Please take another look and merge when ready.