refactor: 使用flutter对原先的web项目重构，正在进行中

app/lib/src/game/views.dart

@@ -0,0 +1,58 @@
+// 渲染层只读的"视图"接口：让 sprites.dart 不依赖完整游戏类，避免循环依赖。
+import 'dart:ui' show Color;
+
+abstract class PlayerView {
+  double get x;
+  double get y;
+  double get w;
+  double get h;
+  double get cx;
+  double get cy;
+  bool get grounded;
+  int get facing;
+  bool get hasGun;
+  bool get dead;
+}
+
+abstract class EntityView {
+  double get x;
+  double get y;
+  double get w;
+  double get h;
+  bool get active;
+  bool get falling;
+  String get dir;
+}
+
+abstract class MoverView {
+  double get x;
+  double get y;
+  double get w;
+  double get h;
+  double get ax;
+  double get ay;
+  double get aw;
+  double get ah;
+  double get bx;
+  double get by;
+}
+
+abstract class BulletView {
+  double get x;
+  double get y;
+  double get w;
+  double get h;
+  String get col;
+  bool get big;
+}
+
+class DeathFX {
+  double x, y;
+  int t;
+  DeathFX(this.x, this.y, this.t);
+}
+
+class DeathMark {
+  double x, y;
+  DeathMark(this.x, this.y);
+}