fix: resolve flutter analyze errors - remove leaked code, fix method calls, cleanup imports

lib/app/router/route_names.dart

@@ -6,10 +6,20 @@ class RouteNames {
   static const login = '/login';
   static const search = '/search';
   static const genres = '/genres';
-  static const novelDetail = '/novel';
-  static const reader = '/reader';
   static const bookshelf = '/bookshelf';
-  static const comments = '/comments';
   static const profile = '/profile';
   static const settings = '/settings';
+
+  // Path-param based routes
+  static const novelDetailPath = '/novel/:id';
+  static const readerPath = '/reader/:chapterId';
+  static const commentsPath = '/comments/:novelId';
+
+  // Navigation helpers
+  static String novelDetail(String id) => '/novel/$id';
+  static String readerChapter(String chapterId) => '/reader/$chapterId';
+  static String commentsFor(String novelId, {String? chapterId}) {
+    final base = '/comments/$novelId';
+    return chapterId != null ? '$base?chapterId=$chapterId' : base;
+  }
 }