chore(deps): remove unused cpy-cli dependency (#160)

* chore(deps): remove unused cpy-cli dependency

cpy-cli was listed in devDependencies but not referenced in any scripts,
source files, or CI configuration.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* Update lockfile

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Author: joris974

package.json

@@ -22,7 +22,6 @@
   "devDependencies": {
     "@types/jest": "^30.0.0",
     "@types/lodash": "^4.17.24",
-    "cpy-cli": "7.0.0",
     "jest": "^30.3.0",
     "jest-environment-jsdom": "^30.3.0",
     "prettier": "^3.8.3",