Add Dependabot configuration for Cargo and npm dependencies

[AugistineCreates]

This pr closes #426

This pull request adds a Dependabot configuration file (.github/dependabot.yml) to the repository. The file tells GitHub’s Dependabot to monitor both Rust (Cargo) and JavaScript (npm) packages that live in the repository root. It runs on a weekly schedule and will open up to 10 pull requests at a time, covering all dependency types.

Why this matters:

• Automated security updates – Vulnerable crates and npm packages will be identified and updated without manual effort.
• Consistent version management – Keeps backend dependencies up‑to‑date, reducing technical debt and potential build failures.
• Compliance with project standards – Aligns the repo with the DevOps guidelines described in IMPLEMENTATION_SUMMARY.md and TASK_QUEUE_SUMMARY.md.

What changed:

• Created a new file .github/dependabot.yml containing the weekly scan settings for the cargo and npm ecosystems. No existing source code was modified.

Verification:

• The new branch (dependabot-setup) builds and passes all CI checks (linting, unit tests, and build).
• The YAML file validates correctly in GitHub’s Dependabot UI.

Impact:
Only repository configuration is altered, so there’s no runtime impact on the application. Once merged, Dependabot will start creating pull requests for any out‑of‑date or insecure dependencies, streamlining maintenance.

Next steps:
Review and merge this PR; Dependabot will then begin its weekly scans.

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