Refactor: Remove original Dart references from comments across multiple files

- Updated comments in various components, schemas, and repositories to remove references to original Dart files.
- Ensured consistency in documentation while maintaining the context of the code.

src/app/splash/components/splash-background.tsx

@@ -1,7 +1,7 @@
 /**
  * Splash 背景图片
  *
- * 原始 Dart: lib/ui/splash/widgets/splash_background.dart
+ * 
  *   `SizedBox.expand(child: Assets.images.picBgHome.image(fit: BoxFit.cover))`
  * 资源: /public/images/splash/pic-bg-home.png (kebab-case 重命名后)
  *       原名: pic_bg_home.png (snake_case)

src/app/splash/components/splash-loading.tsx

@@ -1,7 +1,7 @@
 /**
  * Splash 加载状态
  *
- * 原始 Dart: lib/ui/splash/widgets/splash_loading.dart
+ * 
  *
  * 包装 `<LoadingIndicator>`，splash 阶段可能用于等待 auth 检查。
  */

src/app/splash/components/splash-progress.tsx

@@ -1,7 +1,7 @@
 /**
  * Splash 进度条
  *
- * 原始 Dart: lib/ui/splash/widgets/splash_progress.dart
+ * 
  *
  * 当前实现：简单 CSS 动画进度条，0 → 100% 1.5s。
  */