Preserve update logs in precheck update info

[Copilot]

AddListenerUpdatePrecheck received update version metadata without UpdateLog, even when the server response included updateLog. The field was lost while converting VersionEntry into DownloadAsset, then reconstructing VersionEntry for event dispatch.

• Carry release notes through the download model

  • Added DownloadAsset.UpdateLog as an init-only property.
  • Preserves existing DownloadAsset constructor compatibility.

• Preserve mappings across the update pipeline

  • HttpDownloadSource.MapVersionEntry now copies VersionEntry.UpdateLog.
  • ClientStrategy now copies DownloadAsset.UpdateLog when building UpdateInfoEventArgs.

• Regression coverage

  • Covers VersionEntry → DownloadAsset mapping.
  • Covers ClientStrategy.ExecuteAsync precheck callback receiving UpdateLog.

var versionInfos = downloadPlan.Assets.Select(a => new VersionEntry
{
    Version = a.Version,
    UpdateLog = a.UpdateLog,
    // existing fields...
}).ToList();

• Fixes [ERROR] AddListenerUpdatePrecheck中updateInfo拿不到UpdateLog，UpdateLog为空 #534

[Copilot]

Copilot review overview

🟢 Approval recommended

All reviewed changes are covered and no unresolved blocking issues were identified.

Review effort: Lite
Findings: None

What changed in this PR

Preserves server-provided UpdateLog metadata through download mapping and precheck callbacks.

Changes:

• Adds DownloadAsset.UpdateLog.
• Propagates logs through HTTP mapping and ClientStrategy.
• Adds regression coverage.

File	Description
tests/​CoreTest/​Strategy/​ClientStrategyUpdateLogTests.cs	Tests precheck log delivery.
tests/​CoreTest/​Download/​Sources/​HttpDownloadSourceTests.cs	Tests mapping preservation.
tests/​CoreTest/​Download/​DownloadModelsTests.cs	Tests property defaults and assignment.
src/​GeneralUpdate.Core/​Strategy/​ClientStrategy.cs	Includes logs in update events.
src/​GeneralUpdate.Core/​Download/​Sources/​HttpDownloadSource.cs	Maps VersionEntry.UpdateLog.
src/​GeneralUpdate.Core/​Download/​Models/​DownloadAsset.cs	Adds release-note metadata.

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