feat(i18n): add Traditional Chinese localization (#3093)

* Add Traditional Chinese localization

* fix: address zh-TW formatting and token units

- Format `zh-TW.json` with Prettier.
- Use Traditional Chinese `萬` and `億` units for zh-TW token summaries.
- Add usage formatting coverage for Traditional Chinese locale aliases.

---------

Co-authored-by: Jason <farion1231@gmail.com>

src-tauri/src/settings.rs

@@ -443,7 +443,7 @@ impl AppSettings {
             .language
             .as_ref()
             .map(|s| s.trim())
-            .filter(|s| matches!(*s, "en" | "zh" | "ja"))
+            .filter(|s| matches!(*s, "en" | "zh" | "zh-TW" | "ja"))
             .map(|s| s.to_string());
 
         if let Some(sync) = &mut self.webdav_sync {

src-tauri/src/tray.rs

@@ -47,6 +47,14 @@ impl TrayTexts {
                 quit: "終了",
                 _auto_label: "自動 (フェイルオーバー)",
             },
+            "zh-TW" => Self {
+                show_main: "開啟主介面",
+                open_website: "開啟官方網站",
+                no_providers_label: "(無供應商)",
+                lightweight_mode: "輕量模式",
+                quit: "退出",
+                _auto_label: "自動 (故障轉移)",
+            },
             _ => Self {
                 show_main: "打开主界面",
                 open_website: "打开官方网站",