Remove the redundant $original_server property and use $mainServer throughout
ApplicationDeploymentJob. Both properties held the same value (the deployment
target server), causing unnecessary duplication.
Also fixes two bugs in generate_compose_file() where $this->server was used
instead of $this->mainServer for isSwarm() and isLogDrainEnabled() checks.
When using a build server, $this->server could point to the build server,
causing incorrect configuration for the deployment target.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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