chore: add Dependabot configuration and critical-vuln gate

[MusaMisto]

Adds .github/dependabot.yml (category: npm-frontend, target-branch: develop), .github/workflows/critical-vuln-check.yml, and .github/workflows/dependabot-auto-merge.yml as part of the org-wide Dependabot rollout.

[coderabbitai]

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