## Summary
Add the G0 Godot Stage sidecar preview for `stage-tamagotchi`.
## Design
- Keep Electron as the desktop host and run Godot as a separate sidecar
window by design.
- Use the settings window as the entry point for starting/stopping the
experimental Godot Stage.
- Require explicit `GODOT4` in development mode instead of
auto-discovering local Godot installs.
- Use the packaged sidecar under `process.resourcesPath/godot-stage` in
the packaged runtime.
- Close the Godot WebSocket lifecycle channel on startup failure and
stage shutdown.
## Changes
- Add the Electron main-side Godot Stage lifecycle service.
- Add renderer/settings wiring for switching to the experimental Godot
Stage.
- Add the minimal Godot stage runtime skeleton and WebSocket handshake
path.
- Add Godot export presets for sidecar builds.
- Add sidecar path verification for the Godot export preset and
`electron-builder` resource contract.
- Document the development runtime setup and packaging expectations.
## CI/CD
- Align Godot CI to `4.6.2`.
- Add Linux Godot export smoke coverage as the fastest CI export path.
- Add sidecar contract verification to CI.
- Run packaged sidecar verification after `electron-builder --dir`.
CD is intentionally deferred in this PR. The release workflow still
needs a later step to export the Godot sidecar before packaging release
artefacts.
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Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>
## Description
<!-- Please insert your description here and especially provide info
about the "what" this PR is solving -->
`vue-router` is producing a warning about duplicate route `/devtools` on
`stage-web`. Removing `stage-web/src/pages/devtools/index.vue` resolves
the warning.
There is a duplicate route introduced in
`stage-pages/src/pages/devtools/index.vue`. The file in `stage-web` is
removed in favor of the one in `stage-pages`.
related commit
[`44ec5e4`](https://github.com/moeru-ai/airi/commit/44ec5e416c04ab6fe1d39f01f67330703078439d)
## Linked Issues
<!-- Optional, if you have any -->
## Additional Context
<!-- e.g. is there anything you'd like reviewers to focus on? -->
---------
Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>
Co-authored-by: Neko <neko@ayaka.moe>
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