feat(physics): debug-draw character controller capsule

CharacterVirtual is not a registered body, so PhysicsSystem::DrawBodies
never renders it (Jolt provides no CharacterVirtual::DebugDraw either).
Add CharacterController::DebugDraw (shape wireframe at foot-origin +
shapeOffset, green) and drive it from CollectDebugData under the
colliders bit.

Engine/include/Engine/Physics/CharacterController.h

@@ -59,6 +59,10 @@ namespace Engine {
 
         const Params& GetParams() const { return m_Params; }
 
+        // 调试渲染：非 body，PhysicsSystem::DrawBodies 画不到，须手动
+        // （脚本在物理位姿/脚底原点处画胶囊线框）
+        void DebugDraw(JPH::DebugRenderer& renderer) const;
+
     private:
         Params m_Params;
         JPH::Ref<JPH::CharacterVirtual> m_Character;