feat: add profile path command and improve config visibility

[joshrotenberg]

Summary

Makes profile configuration more discoverable by showing users where their config files are stored.

Addresses #251

Changes

• ✨ Added profile path command to show config file location
• 📍 profile list now shows config file path at the top
• 💾 profile set shows where the config was saved

Examples

New profile path command

$ redisctl profile path
/Users/username/.config/redisctl/config.toml

Enhanced profile list output

$ redisctl profile list
Configuration file: /Users/username/.config/redisctl/config.toml

NAME            TYPE         DETAILS
--------------- ------------ ------------------------------
cloud-prod*     cloud        URL: https://api.redislabs.com/v1
enterprise-dev  enterprise   URL: https://localhost:9443, User: admin@cluster.local (insecure)

Improved profile set feedback

$ redisctl profile set test-profile --deployment cloud --api-key xxx --api-secret yyy
Profile 'test-profile' saved successfully to:
  /Users/username/.config/redisctl/config.toml
Set 'test-profile' as the default profile? (Y/n):

Impact

• Users can easily find their config file for manual editing or backup
• Reduces confusion about where profiles are stored
• Makes troubleshooting easier

Testing

• profile path command works
• profile list shows config path
• profile set shows save location
• All tests pass