feat: add eslint, prettier, and husky lint-staged hooks

[bibekjoshi01]

feat #61

Summary

• Integrates ESLint (Next.js core-web-vitals) and Prettier
• Adds Husky + lint-staged to enforce style on commit
• Adds optional pre-push lint gate

Changes

• Added ESLint/Prettier config files and ignores
• Added Husky hooks for pre-commit and pre-push
• Added lint/format scripts and lint-staged config

Checklist

• npm install succeeds locally
• lint-staged runs on staged files
• npm run lint passes

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[M4dhav]

Please fix merge conflicts

[M4dhav]

Remove unrelated commits and changes from the PR