ci: configure dependabot

[rohitkumarnaidu]

📝 Pull Request Summary

Configures Dependabot to automatically keep LearnSphere's Node.js, Python, and GitHub Actions dependencies up-to-date, improving the long-term security and stability of the platform. 🤖

Note: This PR is proudly submitted as part of the ECSoC / ELUSOC 2026 open-source program. 🚀

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🔗 Related Issue

Closes #245

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🔄 Type of Change

• 🐛 Bug fix (non-breaking change that fixes an issue)
• ✨ New feature (non-breaking change that adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality to change)
• 📚 Documentation update
• ♿ Accessibility improvement
• ⚡ Performance improvement
• 🔒 Security fix
• 🔧 CI/Tooling change

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📋 Changes Made

• Created .github/dependabot.yml.
• Configured weekly updates for pip (backend) and npm (frontend).
• Configured monthly updates for github-actions.
• Automatically assigned @omroy07 as both the assignee and reviewer for automated PRs.
• Automatically tags automated PRs with the dependencies label and specific ecosystem labels (python, javascript, ci).

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🧪 Testing

• Opened the affected pages in a browser — no visual regressions
• Opened browser DevTools console — no new errors or warnings
• Tested on mobile viewport (DevTools responsive mode at 375px width)
• Verified accessibility with keyboard-only navigation
• Tested on multiple browsers (Chrome, Firefox) if applicable

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✅ Contributor Checklist

• My branch is up-to-date with main
• I have tested my changes locally
• My changes do not introduce console errors or warnings
• I have not included unrelated changes
• No secrets, API keys, or credentials are committed
• My commit messages follow the Conventional Commits format

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