Add Vitest-based mint integration tests and wire Blockfrost env vars into CI/Turbo

[Copilot]

• Added Vitest and split test scripts into:

  • test:aiken (Aiken checks)
  • test:unit (Vitest)
  • test runs both via npm-run-all

• Introduced an integration mint test (src/mint.test.ts) that builds a mint transaction end-to-end using:

  • @evolution-sdk/aiken-uplc evaluator
  • @evolution-sdk/scalus-uplc evaluator
    and asserts a CBOR transaction is produced.

• Added IntegrationConfig to validate required env vars (BLOCKFROST_API_KEY, SEED_PHRASE).

• Moved createScript into src/script.ts to share script creation logic between CLI (mint.ts) and tests.

• Ensured env vars are available everywhere they’re needed:

  • CI job exports BLOCKFROST_API_KEY and SEED_PHRASE from GitHub Secrets
  • Turbo picks them up via globalEnv

• Added vitest.config.ts with inline deps for the evaluator packages to avoid bundling/runtime issues.

Why

• Provide a repeatable integration-level check that our mint transaction building works with both evaluators, catching regressions earlier.
• Make CI/Turbo execution consistent by explicitly propagating required Blockfrost/wallet env vars.

Notes

• The mint test expects funded wallet UTxOs via SEED_PHRASE + BLOCKFROST_API_KEY and will fail fast with a clear message if they’re missing.