- Replaced direct `HttpClient` dependencies with `IHttpClientFactory` in `GithubService`, `ForgejoService`, and `ReleaseAssetDownloadService`.
- Added DI-configured HTTP client registrations for GitHub, Forgejo, and asset downloads in `Program.cs`.
- Consolidated HTTP client setup to enhance maintainability, configurability, and resource lifecycle management.
- Added `CancellationToken` support across SyncService, GithubService, ForgejoService, and ReleaseAssetDownloadService.
- Improved error handling with detailed logging for asset downloads, deletions, and API operations.
- Refactored SyncService for clearer repository and asset synchronization logic.
- Enhanced performance with async file streams and refined conditional checks.
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