fix(ci): add Windows desktop build to staging deployment

[FSM1]

Summary

• Adds a build-desktop-windows job to deploy-staging.yml that builds Windows .msi/.exe installers with staging env vars baked in
• Uses the same WinFsp hash-verified install + MSI resource bundling pattern from CI
• Both macOS and Windows desktop builds run in parallel and upload artifacts to the same GitHub prerelease
• Updated release body to mention both platforms with unsigned-app instructions

Test plan

• Push a staging tag (e.g. v0.16.1-staging-rc-1) and verify both build-desktop and build-desktop-windows jobs run
• Confirm the GitHub prerelease contains both .dmg and .msi/.exe artifacts
• Verify deploy-vps is unaffected (no dependency on desktop builds)

🤖 Generated with Claude Code

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📥 Commits

Reviewing files that changed from the base of the PR and between 815460f and d8c5562.

📒 Files selected for processing (1)

• .github/workflows/deploy-staging.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feat/windows-staging-build

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