[codex] Add Simplified Chinese localization

[IPFR33LY]

Closes #114.

Summary

Adds Simplified Chinese (zh-CN) UI localization for EVEMon.

Changelog

• Added persisted UI language selection with English and Simplified Chinese options.
• Applied selected culture at startup before runtime forms are created.
• Added zh-CN satellite resource files for runtime EVEMon projects.
• Moved common designer literals into .resx resources so translated UI strings can load correctly.
• Added restart-required messaging when the selected UI language changes.

Validation

• dotnet restore EVEMon.sln --source https://api.nuget.org/v3/index.json
• dotnet build EVEMon.sln -c Debug --no-restore
• Resource validation: no missing zh-CN keys and no lost {0} placeholders.

Notes

dotnet test EVEMon.sln -c Debug --no-build --no-restore still has one existing failure in Tests.EVEMon.Common.AsyncVoidMethodsTests.EnsureNoAsyncVoidMethods for pre-existing SSOWebServerHttpListener async-void methods.

[mgoeppner]

Hi! Thanks for your contribution!

Can you confirm how you translated this? Was it ai translated or are you a speaker? EVE chinese terminology is not always easily translated.

[mgoeppner]

Hi!

I have had some Chinese speakers review this, and they are quite confused about some of what they believe are AI translated phrases.

If you wish to continue working on this PR, let me know, there are a number of code changes which are also necessary, and if so I will happily mark them for you. I can also sort some Chinese speaking players to help with the translation process.

Cheers!