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;

Engine/src/Physics/CharacterController.cpp

@@ -5,6 +5,10 @@
 #include <Engine/Physics/CharacterController.h>
 
 #include <Jolt/Physics/Collision/Shape/CapsuleShape.h>
+#include <Jolt/Physics/PhysicsSystem.h>
+#include <Jolt/Physics/Body/Body.h>
+#include <Jolt/Physics/Collision/Shape/Shape.h>
+#include <Jolt/Renderer/DebugRenderer.h>
 
 namespace Engine {
 
@@ -85,4 +89,15 @@ namespace Engine {
             JPH::RVec3(position.x, position.y, position.z));
     }
 
+    void CharacterController::DebugDraw(JPH::DebugRenderer &renderer) const {
+        // 胶囊中心 = 脚底原点 + shapeOffset（角色不旋转，纯平移）。
+        // CharacterVirtual 非 body，DrawBodies 永远画不到它——这是
+        // Jolt 层面的缺口（连 CharacterVirtual::DebugDraw 都没有）
+        const JPH::RMat44 t = JPH::RMat44::sTranslation(
+            m_Character->GetPosition() +
+            JPH::RVec3(m_Character->GetShapeOffset()));
+        m_Character->GetShape()->Draw(&renderer, t, JPH::Vec3::sOne(),
+                                      JPH::Color::sGreen, false, true);
+    }
+
 } // namespace Engine

Engine/src/Physics/PhysicsWorld.cpp

@@ -326,6 +326,14 @@ namespace Engine {
             }
         }
 
+        // 4) 角色控制器：CharacterVirtual 非 body，DrawBodies 画不到，
+        //    手动画胶囊线框（绿 = 与普通 collider 区分）
+        if ((m_DebugBits & kPhyDbgColliders) != 0) {
+            for (auto &[bits, entry] : m_Characters) {
+                entry.cc->DebugDraw(*m_DebugDraw);
+            }
+        }
+
         // 释放上一帧缓存不再引用的通用几何 batch（DebugRenderer 内部池）
         m_DebugDraw->NextFrame();
     }