⚡ Optimize MicrotubuleTorus rendering with InstancedMesh

[jason420247]

💡 What: Replaced individual mesh rendering in the MicrotubuleTorus component with THREE.InstancedMesh.

🎯 Why: Rendering thousands of individual meshes is extremely expensive. Using InstancedMesh reduces the draw calls for the two toruses in the scene from 1080 (360 + 720) to just 2.

📊 Measured Improvement: Theoretical reduction of draw calls from 1080 to 2 per scene for the affected components. Improved CPU performance by reusing an Object3D instance for matrix calculations, reducing per-frame allocations. Verified the implementation with syntax and formatting checks.

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PR created automatically by Jules for task 906254860445804285 started by @jason420247

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