test: ✅ initialize test suit

[lorenzo-mignola]

Summary

This PR introduces unit testing to the project using Vitest. It establishes the testing infrastructure and includes an initial test suite for the list command.

Changes

🧪 Testing Infrastructure

• Added vitest as a development dependency.
• Configured the test script in package.json.
• Implemented initial unit tests for the list command to verify core functionality.

🛠 Refactoring for Testability

• Decoupled CLI Subcommands: Moved the subcommand array into a separate module. Previously, the CLI structure was difficult to access programmatically; this move allows the test suite to import the CLI configuration directly for validation without side effects.

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How to Verify

To run the new test suite, use the following command:

pnpm run test

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