ci: use centralized vuln remediation workflow from infra

[ulziibay-kernel]

Replace per-repo workflow + prompt with a thin caller that invokes the reusable 3-stage pipeline (triage → fix → PR) in kernel/infra. Per-repo config in .github/vuln-remediation.json.

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Note

Low Risk
Low risk: adds a scheduled/manual GitHub Actions workflow and a minimal socket.yml config file; no application/runtime code changes.

Overview
Introduces a scheduled + manually-triggerable Vulnerability Remediation GitHub Actions workflow that delegates to the centralized reusable workflow in kernel/security-workflows, with permissions to open PRs and commit fixes.

Adds a minimal socket.yml (version: 2) to enable Socket configuration for dependency/vulnerability tooling.

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