fix: 修复远端公告不刷新与盔甲面板未翻译

Bug1 远端公告：公告只在启动时拉取一次，且点铃铛不触发刷新。
- openCenter 时补调 refresh()，点铃铛即拉最新
- watch skinSiteStatus，登录皮肤站后自动重试拉取

Bug2 盔甲翻译：补 7 个缺失的 app.skins.armor.* i18n 键
（title/save/close/description/unsaved/reset-to-saved/restore-defaults），
ui 包的 skin.preview.armor.* 46 个键已存在无需补。

apps/app-frontend/src/locales/zh-CN/index.json

@@ -11385,5 +11385,12 @@
 	"app.settings.logs.export.modal.cancel": { "message": "取消" },
 	"app.settings.logs.export.modal.confirm": { "message": "导出" },
 	"app.settings.logs.export.notification-title": { "message": "日志已导出" },
-	"app.settings.logs.export.notification-text": { "message": "日志压缩包已保存到 {path}" }
+	"app.settings.logs.export.notification-text": { "message": "日志压缩包已保存到 {path}" },
+  "app.skins.armor.title": {"message": "盔甲与纹饰"},
+  "app.skins.armor.save": {"message": "保存"},
+  "app.skins.armor.close": {"message": "关闭"},
+  "app.skins.armor.description": {"message": "在皮肤上试穿盔甲与纹饰。未保存前不会写入任何内容。"},
+  "app.skins.armor.unsaved": {"message": "有未保存的更改"},
+  "app.skins.armor.reset-to-saved": {"message": "重置为已保存"},
+  "app.skins.armor.restore-defaults": {"message": "恢复默认"}
 }