fix(enterprise): user list command fails with "error decoding response body"

[joshrotenberg]

Problem

The enterprise user list command fails with "error decoding response body".

Steps to Reproduce

redisctl enterprise user list

# Error: Connection error: error decoding response body

Expected Behavior

Should list all users in the cluster, including the admin user created during bootstrap.

Likely Cause

Type definition mismatch in the User struct. The API response may include fields not present in our type definition or have different types than expected.

Acceptance Criteria

• enterprise user list command works without errors
• Shows at least the admin user created during bootstrap
• Can format output as table, json, or yaml
• Add integration test for this command

Part of #315

[joshrotenberg]

Fixed in PR #327