Add CodeQL analysis workflow for Go (Continuous SDL / S360)

[soeviturek]

Purpose

Add a scheduled CodeQL analysis workflow for the Go code in this repository to satisfy the Continuous SDL (S360) CodeQL requirement (fresh snapshot required at least every 30 days).

What this does

• Runs CodeQL for go on pushes to main, on PRs, weekly (Mon 09:00 UTC), and via manual dispatch.
• Uses build-mode: none (buildless Go extraction) since this repo has no go.mod (GOPATH-era layout) and uses Windows-specific build scripts, so autobuild is not viable. Buildless extraction is OS-agnostic and runs on ubuntu.
• Action versions pinned to a commit SHA.

No production code is changed.

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