fix(installer): stop auto-installing smbus broker service

[hyperb1iss]

Motivation

• Remove the installer behavior that silently registers/starts the privileged LocalSystem HypercolorSmBus broker during a per-machine install to prevent unprivileged interactive users from gaining unauthenticated access to privileged SMBus/MSR/SMN operations.

Description

• Remove automatic invocation of install-windows-smbus-service.ps1 from NSIS_HOOK_POSTINSTALL in crates/hypercolor-app/installer-hooks.nsh and update the installer text to make broker setup an explicit administrator action while preserving the bundled PawnIO install and firewall rule additions.

Testing

• Attempted to run workspace checks with just check but just is not available in this environment so no automated test run was performed; the change was validated by confirming the post-install hook no longer invokes the service installer and committing the patch.

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Codex Task

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 32dc71f9-859a-4502-aacc-d7eb340d58ec

📥 Commits

Reviewing files that changed from the base of the PR and between 6f749b6 and 81e9af9.

📒 Files selected for processing (1)

• crates/hypercolor-app/installer-hooks.nsh

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/fix-unauthenticated-system-smbus-broker-vulnerability

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