Migrated the legacy VB.NET Windows Service to a modern C# Worker Service targeting .NET Framework 4.6.2. Key changes include:
- Added `Microsoft.Extensions.Hosting.WindowsServices`, `NLog`, and `Quartz` for logging and scheduling.
- Introduced `LogConfigFactory` to bridge `ServiceConfig` and `LogConfig` for Quartz jobs.
- Rewrote `Worker` to handle the full service lifecycle, including database connection, temp file management, and scheduler initialization.
- Implemented `SchedulerFinishEnvelope` and `SchedulerEnvelopeTaskApi` for Quartz job scheduling.
- Created `TempFiles` for service-level temp file management.
- Configured `NLog` for file and console logging.
- Updated `appsettings.json` for connection strings and service-specific configuration.
- Replaced legacy `ProjectInstaller` with `AddWindowsService()` for SCM integration.
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