feat: SEO improvements

[SinhaS12]

SEO Optimization PR

Fixed Critical Issues:

• ✅ Canonical URL: Fixed from localhost:3002 to https://1ai.co
• ✅ Missing SEO Files: Added robots.txt and sitemap.xml
• ✅ PWA Support: Added manifest.json for mobile experience

Why This Matters:

• SEO Audit Found: Site had poor scores due to wrong URLs and missing files
• Search Visibility: Google couldn't properly index the site
• Mobile Experience: PWA manifest improves mobile UX

Files Added:

public/robots.txt       # Search engine crawling rules
public/sitemap.xml      # Page indexing guide  
public/manifest.json    # PWA support
config/site.ts          # Fixed canonical URL

SEO Audit Tool Used: https://www.seobility.net/en/seocheck/check/?url=https%3A%2F%2F1ai.co%2Fask&mode=standard