Add Simplified Chinese localization and publish icon asset

[HexBen123]

Summary

• Add Simplified Chinese localization coverage across the main UI, dialogs, per-game overrides, component rows, and dynamic status/action text.
• Keep technical and product names such as HDR, ReShade, RenoDX, DXVK, OptiScaler, and Luma in English while translating ordinary UI text.
• Ensure the published WinUI app includes icon.ico so the window icon loads after installation.

Validation

• dotnet test RenoDXCommander.Tests\RenoDXCommander.Tests.csproj --filter LocalizationServiceTests
• dotnet publish RenoDXCommander\RenoDXCommander.csproj -c Release -p:Platform=x64 -r win-x64 -p:PublishSingleFile=true -p:PublishReadyToRun=false -o artifacts\publish\RHI-win-x64
• Built the local Inno Setup installer from artifacts\installer\RHI Setup.local.iss

Notes

• Localization uses English internal values for option logic while presenting translated labels, so existing comparisons and saved settings remain compatible.
• The installer artifact is generated locally and is not included in this PR.