Integration tests require active plan + rely on brittle backend error strings

[Sourya07]

Hi maintinaers
After setting up METACALL_AUTH_EMAIL/PASSWORD and fixing Node version,
most tests pass.

Remaining failures are due to:

1. Deploy integration tests assuming an active paid plan
   (addrepo/workdir/delete/list plans all fail with "No deployment found")

2. Login negative tests relying on exact backend error strings
   which appear to have changed.

This makes it impossible for new contributors to pass the full suite
without purchasing a plan.

Suggestion:

• Mock deploy endpoints OR
• Skip deploy integration tests if no active plan
• Relax string equality to partial matching for auth errors

Happy to help with a PR if desired.

[Sourya07]

@josead sir please look on this
happy to make a pr on this
thanks