fix(stage-ui-three): OrbitControl initialisation (#1877)

## 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.

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Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>