Add machine-scope config hydration for OEM sysprep flows

[benceruleanlu]

Summary

• add Windows machine-scope config support rooted in ProgramData (machine-config.json)
• hydrate missing per-user desktop config from machine-scoped config on first launch
• persist machine-scope install metadata/state during install and state transitions
• resolve model config path and default install path from machine scope when applicable
• add installer CLI parsing and persistence for OEM options (/INSTALL_SCOPE, /ALLUSERS, /CURRENTUSER, /OEM, /BASE_PATH, /AUTO_UPDATE, /DISABLE_AUTO_UPDATE, /PRESEED_CONFIG_DIR)
• add tests for machine config utilities and install-state hydration
• add AMD OEM requirement verification/design doc

Validation

• yarn lint
• yarn typecheck
• yarn test:unit tests/unit/config/machineConfig.test.ts tests/unit/main-process/comfyInstallation.test.ts tests/unit/config/comfyServerConfig.test.ts tests/unit/install/installationManager.test.ts

Notes

• Confidential source artifacts are not included in this PR.

┆Issue is synchronized with this Notion page by Unito

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch ben/oem-machine-scope-install-state

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