Job execution commands and site archive import/export

[clavery]

Summary

• Add job execution commands: job run, job wait, job search
• Add site archive commands: job import, job export
• Add JobCommand base class to b2c-tooling for shared job log display functionality
• Use OCAPI generated type aliases instead of wrapper interfaces
• Extract error messages from failed job step executions
• Library logs at debug level; CLI handles user-facing output

New Commands

Command	Description
b2c job run	Execute a job on a B2C Commerce instance
b2c job wait	Wait for a job execution to complete
b2c job search	Search for job executions
b2c job import	Import a site archive using sfcc-site-archive-import
b2c job export	Export a site archive using sfcc-site-archive-export

Test plan

• b2c job run <job-id> starts a job
• b2c job run <job-id> --wait waits for completion
• b2c job search lists recent job executions
• b2c job import ./data uploads and imports site archive
• b2c job export --global-data meta_data exports and downloads archive