chore: clean up node dependencies

[viqueen]

Summary

• Remove unused CLI wrappers (axios-cli, rest cli, sftp client, mail parser, helper servers)
• Remove obsolete scripts (csvgen, mock-server, serve-static, etc.)
• Clean up unused node dependencies (axios, express, morgan, nodemailer, ssh2-sftp-client, etc.) from package.json and package-lock.json

Test plan

• Verify remaining CLI tools still work
• Verify npm install completes successfully

🤖 Generated with Claude Code

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud