Remove manual minLovelace calculation now that SDK returns correct value

[Copilot]

calculateMinimumUtxoLovelace previously omitted the 160-byte UTxO entry overhead from its result, requiring a manual workaround. IntersectMBO/evolution-sdk#169 fixes this, making the workaround unnecessary.

Changes

• src/mint.ts: Remove the manual (cborSize + 160n) * coinsPerUtxoByte calculation and pass the actual coinsPerUtxoByte directly to calculateMinimumUtxoLovelace, using its result as minLovelace.

Before:

const cborSize = await Effect.runPromise(
  calculateMinimumUtxoLovelace({ ..., coinsPerUtxoByte: 1n })
);
const minLovelace = (cborSize + 160n) * coinsPerUtxoByte;

After:

const minLovelace = await Effect.runPromise(
  calculateMinimumUtxoLovelace({ ..., coinsPerUtxoByte })
);

The 1 ADA lovelace placeholder is retained to ensure consistent 5-byte CBOR encoding of the lovelace field.

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