FEAT: Add 'templates' command to list bundled templates

[CaptainLevi25]

Summary

Adds a new templates command to make bundled templates discoverable from the CLI.

Previously, users could apply bundled templates via apply-template, but there was no way to list the available templates without inspecting the repository contents. This change introduces a dedicated command that enumerates bundled templates from the shipped templates/ directory.

Usage

capcut templates or capcut templates -H

Resolves

Resolves #11

Changes

• Added capcut templates command.
• Resolves bundled templates from the package templates/ directory.
• Supports human-readable output with -H / --human.
• Added descriptions for bundled templates:

- caption-pop
- lower-third
- hook-question
- gold-title
- end-card
- subscribe-cta

• Added automated tests covering

Screenshots

capcut templates or capcut templates -H

npm run test

capcut --help

Please review the PR at your convenience and suggest improvements required. I will try my best to resolve it.

Thanks a lot!