feat(#231): add testnet asset configuration consistency check

[CemAyyildiz]

Closes #231

Summary

• Add read-only check-testnet-assets.mjs script with field-level mismatch reporting
• Add passing and mismatch fixture tests
• Wire npm script check:testnet-assets
• Align frontend Sepolia USDC (networks.ts sepolia.testToken, TokenSelector.tsx) with SDK canonical mapping (0xa0b86a33e6417c4fd30ad9d05d6b9b7cd6dd11b)
• Add @oversync/sdk workspace dependency to coordinator so backend services stay tied to canonical asset mappings

Testing

• node scripts/check-testnet-assets.mjs
• pnpm --filter @oversync/sdk test

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