Fix terrain collision by correcting spawn coordinates

- Spawn position changed to (-9080, -100, 100) which is on actual terrain
- The terrain mesh uses WoW coordinates from ADT files directly
- Camera/spawn position must use same coordinate system as terrain
- Cleaned up getHeightAt comments to clarify coordinate system
- Removed debug logging from WMO floor detection

src/rendering/wmo_renderer.cpp

@@ -764,8 +764,6 @@ std::optional<float> WMORenderer::getFloorHeight(float glX, float glY, float glZ
                 }
             }
         }
-
-        // (debug logging removed)
     }
 
     return bestFloor;