chore: expand dependabot config — npm, github-actions, docker major ignore

[aliasunder]

Summary

• Adds npm ecosystem with production/development grouping and a TypeScript major ignore (typescript-eslint peer range constraint)
• Adds github-actions ecosystem for weekly action version updates
• Adds Node major ignore to the existing docker ecosystem — matches the engines >=24 <25 pin in package.json and .nvmrc

Closes the gap with vault-cortex's dependabot setup. PR #2 (Node 24→26 bump) was closed since it's a non-LTS major blocked by this new ignore rule.

Test plan

• Dependabot picks up the new ecosystems on next scheduled run
• No new Node major PRs appear for the docker ecosystem

🤖 Generated with Claude Code

https://claude.ai/code/session_01HBJw5bhDigxu8HM2sPPZVf

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📥 Commits

Reviewing files that changed from the base of the PR and between 1fd592c and 8ae97c7.

📒 Files selected for processing (1)

• .github/dependabot.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/dependabot-config

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