[coldhighsun]

Summary

• Add a Traditional Chinese interface language: new zh-TW.json string table (including data source names and option texts), a ZhTW language choice in settings, and Traditional CJK fallback fonts (Microsoft JhengHei UI / PingFang TC / Noto Sans CJK TC).
• Auto now resolves zh-TW, zh-HK, zh-MO and Hant systems to Traditional Chinese; other Chinese systems stay Simplified, and an explicit Hans script wins over the region (zh-Hans-HK is Simplified).
• Both Chinese languages now default the base currency to CNY (Loc.IsChinese).
• Add ChineseTraditional.isl to the Inno Setup installer. It ships with Inno Setup 7, which the release workflow already uses, so no workflow change is needed.
• Add README.zh-TW.md, link it from the other READMEs, and update the localization notes in CLAUDE.md and docs/ADDING_A_PROVIDER.md.

Notes

• Provider_* / Option_* keys must exist in both Chinese tables; a missing one falls back to English, not to the other Chinese file. A test requires the two tables to have the same keys.
• The zh-TW.json wording is converted from the Simplified table and would benefit from a review by a native Taiwan speaker (for example 持倉).
• README.zh-TW.md reuses the Simplified screenshots.

Test plan

• dotnet build FluxTick.slnx
• dotnet test --solution FluxTick.slnx (all passing)
• Compiled installer/FluxTick.iss with Inno Setup 7
• Switch the language to Traditional Chinese in the running app and check the main window and settings
• Run the installer on a Traditional Chinese system and check the language selection

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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