feat: auto-show deployment logs on failure

[JoshSalway]

Summary

• Automatically fetches and displays deployment logs when cloud deploy or cloud ship fails
• Shows which phase failed (Build vs Deploy) with the actual error output
• Adds GetDeploymentLogsRequest for GET /deployments/{id}/logs and a logs() method on DeploymentsResource
• Gracefully handles cases where the logs endpoint is unavailable or returns empty

Closes #73

Example output

✗ Deployment failed: Build failed

  Build output:
  | Installing composer dependencies...
  | npm ci --audit false
  | npm ERR! Could not resolve dependency: @inertiajs/vue3@^2.0
  | npm ERR! peer dep missing: vue@^3.0

  Do you want to edit the build and deploy commands and try again?

Test plan

• Added test: displays build logs when deployment fails with build error
• Added test: displays deploy logs when deployment fails with deploy error
• Added test: handles failed deployment when logs endpoint returns empty
• All existing tests pass
• PHPStan passes with no errors

🤖 Generated with Claude Code