Support Windows machine-scope installs for OEM imaging

[benceruleanlu]

Summary

• support machine-scope Windows installs for OEM and audit-mode imaging flows
• allow NSIS machine install selection via /INSTALL_SCOPE, /ALLUSERS, /CURRENTUSER, and /OEM
• default machine installs to a ProgramData base path and harden ACLs on that location
• persist only machine install state and base path in ProgramData so OOBE-created users can reuse the install
• hydrate first-launch per-user config from machine install state and recreate per-user extra_models_config.yaml when needed
• keep uv's Python install under ProgramData for machine-scoped installs

Out of Scope

• preseed config import
• shared model-config relocation
• auto-update policy propagation
• model or workflow seeding
• OEM design doc artifacts

Validation

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

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