fix: added android localized app name

[1takedown]

变更说明 / What & Why

• Uses a manifest placeholder to select localized app-name resources.
• Adds English, Korean, and Traditional Chinese app-name resources.
• Keeps Simplified Chinese as the default fallback.

关联 Issue / Related Issue

Close #472

自测情况 / Self-tested

• flutter analyze 无新增告警 / no new warnings
• flutter test 通过 / tests pass
• 已实机运行验证；UI 变更已附截图 / verified on a real device; screenshots attached for UI changes
• 涉及文案变更：已更新 lib/l10n/*.arb 并用 Flutter 3.27.3 运行 flutter gen-l10n / for copy changes: arb files updated and flutter gen-l10n run with Flutter 3.27.3

贡献者许可条款 / Contributor License Terms

• 我已阅读并同意贡献者许可条款 / I have read and agree to the Contributor License Terms