fix(stage-ui-three): OrbitControl initialisation

[Lilia-Chen]

Summary

• Fix the first Live2D -> VRM switch camera regression where OrbitControls could clamp the camera into the model.
• Remove the VRM render scale control from the model settings panel.
• Remove the now-unused settings.vrm.render-scale locale entries.
• Ignore Godot/.NET bin/ and obj/ build artifacts under engines/stage-tamagotchi-godot.

Root Cause

On the first VRM load, OrbitControls can mount before the VRM bootstrap writes a real modelSize. The previous watcher copied modelSize.z = 0 into minDistance and maxDistance, so later camera updates were clamped onto the target before the bootstrap camera pose finished applying.

Changes

• Skip OrbitControls distance-bound updates until modelSize.z is finite and non-zero.
• Keep the render scale runtime state intact, but remove the VRM settings UI entry so it is no longer hot-updated from the panel.
• Add Godot project ignores for local .NET build output.

[github-actions]

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