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/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();
     }