IX-829: Normalize decimal response strings

[mnebliienko]

Summary

• normalize balance decimal response strings in the CLI core resource before rendering or structured output
• preserve precision without Number conversion or exponential notation
• add unit coverage for decimal normalization and balance resource output

Moved the CLI-facing part of server PR #554 to the CLI layer.

Tests

• pnpm --filter @inflowpayai/inflow-core test
• pnpm --filter @inflowpayai/inflow-core build
• pnpm --filter @inflowpayai/inflow-core typecheck
• pnpm --filter @inflowpayai/inflow-core lint
• pnpm --filter @inflowpayai/inflow build
• pnpm format:check

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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