fix: 修复Rust文档测试和添加rapier2d WASM绑定

packages/engine/src/math/color.rs

@@ -12,6 +12,7 @@ use bytemuck::{Pod, Zeroable};
 ///
 /// # Examples | 示例
 /// ```rust
+/// use es_engine::math::Color;
 /// let red = Color::RED;
 /// let custom = Color::new(0.5, 0.7, 0.3, 1.0);
 /// let packed = custom.to_packed(); // For GPU

packages/engine/src/math/rect.rs

@@ -8,6 +8,7 @@ use super::Vec2;
 ///
 /// # Examples | 示例
 /// ```rust
+/// use es_engine::math::{Rect, Vec2};
 /// let rect = Rect::new(10.0, 20.0, 100.0, 50.0);
 /// let point = Vec2::new(50.0, 40.0);
 /// assert!(rect.contains_point(point));

packages/engine/src/math/transform.rs

@@ -9,6 +9,7 @@ use glam::Mat3;
 ///
 /// # Examples | 示例
 /// ```rust
+/// use es_engine::math::{Transform2D, Vec2};
 /// let mut transform = Transform2D::new();
 /// transform.position = Vec2::new(100.0, 200.0);
 /// transform.rotation = std::f32::consts::PI / 4.0; // 45 degrees

packages/engine/src/math/vec2.rs

@@ -8,6 +8,7 @@ use bytemuck::{Pod, Zeroable};
 ///
 /// # Examples | 示例
 /// ```rust
+/// use es_engine::math::Vec2;
 /// let pos = Vec2::new(100.0, 200.0);
 /// let velocity = Vec2::new(1.0, 0.0);
 /// let new_pos = pos + velocity * 16.0;