Fix invalid start state: reorient UR5e attachment sites to clear Vention collisions

[atharva620]

This PR fixes:

• Invalid start state after #9: UR5e shoulder-pan colliding with Vention frame due to misoriented attachment sites #3

Testing instructions:

• cd into geodude_assets/models and run python3 robot_assembly.py --save-mjcf --right-gripper-type=2f140
• Comment out the keyframe in the output geodude.xml

  <keyframe>
    <key name="home" qpos="-1.5708 -1.5708 1.5708 -1.5708 -1.5708 0 -1.5708 -1.5708 1.5708 -1.5708 -1.5708 0 0 0 0 0 0 0 0 0" ctrl="-1.5708 -1.5708 1.5708 -1.5708 -1.5708 0 -1.5708 -1.5708 1.5708 -1.5708 -1.5708 0 0"/>
  </keyframe>

• Run python3 - m mj_ompl.examples.orchestrator to confirm planning does not fail as described in the issue
• To run a full pick and place, follow the same instructions but checkout eef_interface branch on mj_ompl before running the previous step.