ci: add GitHub Actions workflow for linting on PRs

[YashKrTripathi]

FIXES OR CLOSES #12

Pull Request: Set up automated linting workflow for PRs

Description

This pull request introduces a GitHub Actions workflow to automatically run linting checks on every new Pull Request. This ensures consistent code quality and stylistic standards across the entire stack before code is merged.

Changes Made

• Added a new workflow file: .github/workflows/lint.yml.
• Frontend Linting: Added a job to run npm run lint for the Next.js frontend application.
• Server Linting: Added a job to run npm run lint within the Node.js server directory (gracefully ignoring if the script is absent via --if-present).
• Backend Linting: Added a job to install dependencies and run ruff check . for the Python backend directory.

Testing / Verification

• The workflow triggers on the pull_request event for main and master branches.
• Tested locally to ensure the directories and linting commands match the repository structure.

Impact

• Code Quality: Automated linting will catch syntax errors, formatting issues, and anti-patterns early in the review process.
• Review Efficiency: Reduces the manual burden on reviewers to spot stylistic issues, allowing them to focus on logic and architecture.

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